2155328131 has 4 divisors (see below), whose sum is σ = 2351267064. Its totient is φ = 1959389200.

The previous prime is 2155328117. The next prime is 2155328141. The reversal of 2155328131 is 1318235512.

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 2155328131 - 2⁷ = 2155328003 is a prime.

It is a super-2 number, since 2×2155328131² = 9290878704559906322, 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 = 2155328093 and 2155328102.

It is not an unprimeable number, because it can be changed into a prime (2155328101) 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, 97969450 + ... + 97969471.

It is an arithmetic number, because the mean of its divisors is an integer number (587816766).

Almost surely, 2^2155328131 is an apocalyptic number.

2155328131 is a deficient number, since it is larger than the sum of its proper divisors (195938933).

2155328131 is a wasteful number, since it uses less digits than its factorization.

2155328131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195938932.

The product of its digits is 7200, while the sum is 31.

The square root of 2155328131 is about 46425.5116396147. The cubic root of 2155328131 is about 1291.7281749375.

The spelling of 2155328131 in words is "two billion, one hundred fifty-five million, three hundred twenty-eight thousand, one hundred thirty-one".