2155323631 has 8 divisors (see below), whose sum is σ = 2320788240. Its totient is φ = 1994156928.

The previous prime is 2155323623. The next prime is 2155323637. The reversal of 2155323631 is 1363235512.

2155323631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2155323631 - 2³ = 2155323623 is a prime.

It is a super-2 number, since 2×2155323631² = 9290839908694048322, 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 = 2155323593 and 2155323602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155323637) 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, 1073436 + ... + 1075441.

It is an arithmetic number, because the mean of its divisors is an integer number (290098530).

Almost surely, 2^2155323631 is an apocalyptic number.

2155323631 is a deficient number, since it is larger than the sum of its proper divisors (165464609).

2155323631 is a wasteful number, since it uses less digits than its factorization.

2155323631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148953.

The product of its digits is 16200, while the sum is 31.

The square root of 2155323631 is about 46425.4631748570. The cubic root of 2155323631 is about 1291.7272759591.

The spelling of 2155323631 in words is "two billion, one hundred fifty-five million, three hundred twenty-three thousand, six hundred thirty-one".