99999251 has 8 divisors (see below), whose sum is σ = 109444608. Its totient is φ = 90613000.

The previous prime is 99999247. The next prime is 99999257. The reversal of 99999251 is 15299999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99999251 - 2² = 99999247 is a prime.

It is a super-2 number, since 2×99999251² = 19999700401122002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99999193 and 99999202.

It is not an unprimeable number, because it can be changed into a prime (99999257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11195 + ... + 18036.

It is an arithmetic number, because the mean of its divisors is an integer number (13680576).

Almost surely, 2^99999251 is an apocalyptic number.

99999251 is a deficient number, since it is larger than the sum of its proper divisors (9445357).

99999251 is a wasteful number, since it uses less digits than its factorization.

99999251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29553.

The product of its digits is 590490, while the sum is 53.

The square root of 99999251 is about 9999.9625499299. The cubic root of 99999251 is about 464.1577245084.

The spelling of 99999251 in words is "ninety-nine million, nine hundred ninety-nine thousand, two hundred fifty-one".