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51455231 = 199258569
BaseRepresentation
bin1100010001001…
…0010011111111
310120211012022022
43010102103333
5101133031411
65034510355
71163235152
oct304222377
9116735268
1051455231
1127055093
12152953bb
13a8778a9
146b95c99
1547b5edb
hex31124ff

51455231 has 4 divisors (see below), whose sum is σ = 51714000. Its totient is φ = 51196464.

The previous prime is 51455227. The next prime is 51455233. The reversal of 51455231 is 13255415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13255415 = 52651083.

It is a cyclic number.

It is not a de Polignac number, because 51455231 - 22 = 51455227 is a prime.

It is a super-2 number, since 2×514552312 = 5295281594526722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51455231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51455233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129086 + ... + 129483.

It is an arithmetic number, because the mean of its divisors is an integer number (12928500).

Almost surely, 251455231 is an apocalyptic number.

51455231 is a deficient number, since it is larger than the sum of its proper divisors (258769).

51455231 is a wasteful number, since it uses less digits than its factorization.

51455231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258768.

The product of its digits is 3000, while the sum is 26.

The square root of 51455231 is about 7173.2301649954. The cubic root of 51455231 is about 371.9431037005.

The spelling of 51455231 in words is "fifty-one million, four hundred fifty-five thousand, two hundred thirty-one".

Divisors: 1 199 258569 51455231