163256531 has 8 divisors (see below), whose sum is σ = 171973200. Its totient is φ = 154552320.

The previous prime is 163256503. The next prime is 163256537. The reversal of 163256531 is 135652361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163256531 is a prime.

It is a super-2 number, since 2×163256531² = 53305389828307922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163256537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37475 + ... + 41603.

It is an arithmetic number, because the mean of its divisors is an integer number (21496650).

Almost surely, 2^163256531 is an apocalyptic number.

163256531 is a deficient number, since it is larger than the sum of its proper divisors (8716669).

163256531 is a wasteful number, since it uses less digits than its factorization.

163256531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6229.

The product of its digits is 16200, while the sum is 32.

The square root of 163256531 is about 12777.1879144043. The cubic root of 163256531 is about 546.5419743778.

The spelling of 163256531 in words is "one hundred sixty-three million, two hundred fifty-six thousand, five hundred thirty-one".