52165581 has 24 divisors (see below), whose sum is σ = 76247136. Its totient is φ = 31536000.

The previous prime is 52165573. The next prime is 52165609. The reversal of 52165581 is 18556125.

It is not a de Polignac number, because 52165581 - 2³ = 52165573 is a prime.

It is a super-2 number, since 2×52165581² = 5442495682135122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52165501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207706 + ... + 207956.

It is an arithmetic number, because the mean of its divisors is an integer number (3176964).

Almost surely, 2^52165581 is an apocalyptic number.

It is an amenable number.

52165581 is a deficient number, since it is larger than the sum of its proper divisors (24081555).

52165581 is a wasteful number, since it uses less digits than its factorization.

52165581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 340 counting only the distinct ones).

The product of its digits is 12000, while the sum is 33.

The square root of 52165581 is about 7222.5744025244. The cubic root of 52165581 is about 373.6468708724.

The spelling of 52165581 in words is "fifty-two million, one hundred sixty-five thousand, five hundred eighty-one".