51489165 has 64 divisors (see below), whose sum is σ = 103090176. Its totient is φ = 21364992.

The previous prime is 51489161. The next prime is 51489167. The reversal of 51489165 is 56198415.

It is not a de Polignac number, because 51489165 - 2² = 51489161 is a prime.

It is a super-2 number, since 2×51489165² = 5302268224794450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51489161) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 91174 + ... + 91736.

It is an arithmetic number, because the mean of its divisors is an integer number (1610784).

Almost surely, 2^51489165 is an apocalyptic number.

It is an amenable number.

51489165 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

51489165 is a wasteful number, since it uses less digits than its factorization.

51489165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658.

The product of its digits is 43200, while the sum is 39.

The square root of 51489165 is about 7175.5950972724. The cubic root of 51489165 is about 372.0248494789.

The spelling of 51489165 in words is "fifty-one million, four hundred eighty-nine thousand, one hundred sixty-five".