2156535631 has 4 divisors (see below), whose sum is σ = 2182518072. Its totient is φ = 2130553192.

The previous prime is 2156535607. The next prime is 2156535649. The reversal of 2156535631 is 1365356512.

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 2156535631 - 2⁵ = 2156535599 is a prime.

It is a super-2 number, since 2×2156535631² = 9301291855545136322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2150535631) 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, 12991096 + ... + 12991261.

It is an arithmetic number, because the mean of its divisors is an integer number (545629518).

Almost surely, 2^2156535631 is an apocalyptic number.

2156535631 is a deficient number, since it is larger than the sum of its proper divisors (25982441).

2156535631 is an equidigital number, since it uses as much as digits as its factorization.

2156535631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25982440.

The product of its digits is 81000, while the sum is 37.

The square root of 2156535631 is about 46438.5145218923. The cubic root of 2156535631 is about 1291.9693556282.

The spelling of 2156535631 in words is "two billion, one hundred fifty-six million, five hundred thirty-five thousand, six hundred thirty-one".