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99975251 = 472127133
BaseRepresentation
bin1011111010110…
…00000001010011
320222010021021002
411331120001103
5201043202001
613530452215
72322530015
oct575300123
9228107232
1099975251
1151484982
122959406b
131793546c
14d3c61b5
158b9c46b
hex5f58053

99975251 has 4 divisors (see below), whose sum is σ = 102102432. Its totient is φ = 97848072.

The previous prime is 99975247. The next prime is 99975257. The reversal of 99975251 is 15257999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15257999 = 23963841.

It is a cyclic number.

It is not a de Polignac number, because 99975251 - 22 = 99975247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 2127133 = 99975251 / (9 + 9 + 9 + 7 + 5 + 2 + 5 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99975196 and 99975205.

It is not an unprimeable number, because it can be changed into a prime (99975257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063520 + ... + 1063613.

It is an arithmetic number, because the mean of its divisors is an integer number (25525608).

Almost surely, 299975251 is an apocalyptic number.

99975251 is a deficient number, since it is larger than the sum of its proper divisors (2127181).

99975251 is a wasteful number, since it uses less digits than its factorization.

99975251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127180.

The product of its digits is 255150, while the sum is 47.

The square root of 99975251 is about 9998.7624734264. The cubic root of 99975251 is about 464.1205886412.

The spelling of 99975251 in words is "ninety-nine million, nine hundred seventy-five thousand, two hundred fifty-one".

Divisors: 1 47 2127133 99975251