2131972155 has 24 divisors (see below), whose sum is σ = 3698854848. Its totient is φ = 1135994496.

The previous prime is 2131972151. The next prime is 2131972187. The reversal of 2131972155 is 5512791312.

It is not a de Polignac number, because 2131972155 - 2² = 2131972151 is a prime.

It is a super-3 number, since 3×2131972155³ (a number of 29 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2131972151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28159 + ... + 71111.

It is an arithmetic number, because the mean of its divisors is an integer number (154118952).

Almost surely, 2^2131972155 is an apocalyptic number.

2131972155 is a deficient number, since it is larger than the sum of its proper divisors (1566882693).

2131972155 is a wasteful number, since it uses less digits than its factorization.

2131972155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44067 (or 44064 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 2131972155 is about 46173.2839962678. The cubic root of 2131972155 is about 1287.0453288824.

The spelling of 2131972155 in words is "two billion, one hundred thirty-one million, nine hundred seventy-two thousand, one hundred fifty-five".