2131973187 has 8 divisors (see below), whose sum is σ = 2852333904. Its totient is φ = 1416463968.

The previous prime is 2131973141. The next prime is 2131973197. The reversal of 2131973187 is 7813791312.

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

It is not a de Polignac number, because 2131973187 - 2⁷ = 2131973059 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2131973197) 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, 1211848 + ... + 1213605.

It is an arithmetic number, because the mean of its divisors is an integer number (356541738).

Almost surely, 2^2131973187 is an apocalyptic number.

2131973187 is a deficient number, since it is larger than the sum of its proper divisors (720360717).

2131973187 is a wasteful number, since it uses less digits than its factorization.

2131973187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425749.

The product of its digits is 63504, while the sum is 42.

The square root of 2131973187 is about 46173.2951715599. The cubic root of 2131973187 is about 1287.0455365509.

The spelling of 2131973187 in words is "two billion, one hundred thirty-one million, nine hundred seventy-three thousand, one hundred eighty-seven".