165250431 has 12 divisors (see below), whose sum is σ = 240886360. Its totient is φ = 109155600.

The previous prime is 165250363. The next prime is 165250447. The reversal of 165250431 is 134052561.

165250431 is a `hidden beast` number, since 1 + 652 + 5 + 0 + 4 + 3 + 1 = 666.

It is not a de Polignac number, because 165250431 - 2⁷ = 165250303 is a prime.

It is a super-2 number, since 2×165250431² = 54615409891371522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165250395 and 165250404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165250451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83245 + ... + 85206.

Almost surely, 2^165250431 is an apocalyptic number.

165250431 is a deficient number, since it is larger than the sum of its proper divisors (75635929).

165250431 is a wasteful number, since it uses less digits than its factorization.

165250431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168566 (or 168563 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 165250431 is about 12854.9768961286. The cubic root of 165250431 is about 548.7580029724.

The spelling of 165250431 in words is "one hundred sixty-five million, two hundred fifty thousand, four hundred thirty-one".