51000165 has 16 divisors (see below), whose sum is σ = 90667200. Its totient is φ = 27200016.

The previous prime is 51000163. The next prime is 51000197. The reversal of 51000165 is 56100015.

It is not a de Polignac number, because 51000165 - 2¹ = 51000163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188755 + ... + 189024.

It is an arithmetic number, because the mean of its divisors is an integer number (5666700).

Almost surely, 2^51000165 is an apocalyptic number.

It is an amenable number.

51000165 is a deficient number, since it is larger than the sum of its proper divisors (39667035).

51000165 is a wasteful number, since it uses less digits than its factorization.

51000165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377793 (or 377787 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 51000165 is about 7141.4399808442. The cubic root of 51000165 is about 370.8433768549.

Subtracting from 51000165 its product of nonzero digits (150), we obtain a palindrome (51000015).

The spelling of 51000165 in words is "fifty-one million, one hundred sixty-five", and thus it is an aban number.