165431263 has 4 divisors (see below), whose sum is σ = 166355640. Its totient is φ = 164506888.

The previous prime is 165431261. The next prime is 165431291. The reversal of 165431263 is 362134561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165431263 - 2¹ = 165431261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165431261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461920 + ... + 462277.

It is an arithmetic number, because the mean of its divisors is an integer number (41588910).

Almost surely, 2^165431263 is an apocalyptic number.

165431263 is a deficient number, since it is larger than the sum of its proper divisors (924377).

165431263 is an equidigital number, since it uses as much as digits as its factorization.

165431263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924376.

The product of its digits is 12960, while the sum is 31.

The square root of 165431263 is about 12862.0085134477. The cubic root of 165431263 is about 548.9580969187.

The spelling of 165431263 in words is "one hundred sixty-five million, four hundred thirty-one thousand, two hundred sixty-three".