2131931907 has 40 divisors (see below), whose sum is σ = 3757140992. Its totient is φ = 1178938800.

The previous prime is 2131931887. The next prime is 2131931927. The reversal of 2131931907 is 7091391312.

It is a happy number.

2131931907 is a `hidden beast` number, since 21 + 319 + 319 + 0 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (2131931887) and next prime (2131931927).

It is not a de Polignac number, because 2131931907 - 2⁶ = 2131931843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131931927) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 43069 + ... + 78222.

Almost surely, 2^2131931907 is an apocalyptic number.

2131931907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2131931907 is a deficient number, since it is larger than the sum of its proper divisors (1625209085).

2131931907 is a wasteful number, since it uses less digits than its factorization.

2131931907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121341 (or 121332 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 2131931907 is about 46172.8481577648. The cubic root of 2131931907 is about 1287.0372297575.

The spelling of 2131931907 in words is "two billion, one hundred thirty-one million, nine hundred thirty-one thousand, nine hundred seven".