51090165 has 48 divisors (see below), whose sum is σ = 102960000. Its totient is φ = 22951296.

The previous prime is 51090133. The next prime is 51090167. The reversal of 51090165 is 56109015.

51090165 is a `hidden beast` number, since 510 + 90 + 1 + 65 = 666.

It is not a de Polignac number, because 51090165 - 2⁵ = 51090133 is a prime.

It is a super-2 number, since 2×51090165² = 5220409919454450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51090167) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17211 + ... + 19959.

It is an arithmetic number, because the mean of its divisors is an integer number (2145000).

Almost surely, 2^51090165 is an apocalyptic number.

It is an amenable number.

51090165 is an abundant number, since it is smaller than the sum of its proper divisors (51869835).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51090165 is a wasteful number, since it uses less digits than its factorization.

51090165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2826 (or 2823 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 51090165 is about 7147.7384535250. The cubic root of 51090165 is about 371.0613911190.

The spelling of 51090165 in words is "fifty-one million, ninety thousand, one hundred sixty-five".