2131897917 has 16 divisors (see below), whose sum is σ = 2945263680. Its totient is φ = 1370808192.

The previous prime is 2131897897. The next prime is 2131897919. The reversal of 2131897917 is 7197981312.

It is not a de Polignac number, because 2131897917 - 2⁸ = 2131897661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131897919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104248 + ... + 123009.

It is an arithmetic number, because the mean of its divisors is an integer number (184078980).

Almost surely, 2^2131897917 is an apocalyptic number.

It is an amenable number.

2131897917 is a deficient number, since it is larger than the sum of its proper divisors (813365763).

2131897917 is a wasteful number, since it uses less digits than its factorization.

2131897917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227372.

The product of its digits is 190512, while the sum is 48.

The square root of 2131897917 is about 46172.4800828372. The cubic root of 2131897917 is about 1287.0303898536.

The spelling of 2131897917 in words is "two billion, one hundred thirty-one million, eight hundred ninety-seven thousand, nine hundred seventeen".