7972131877 has 4 divisors (see below), whose sum is σ = 7997280876. Its totient is φ = 7946982880.

The previous prime is 7972131857. The next prime is 7972131883. The reversal of 7972131877 is 7781312797.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1196537281 + 6775594596 = 34591^2 + 82314^2 .

It is a cyclic number.

It is not a de Polignac number, because 7972131877 - 2²³ = 7963743269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7972131847) 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, 12574024 + ... + 12574657.

It is an arithmetic number, because the mean of its divisors is an integer number (1999320219).

Almost surely, 2^7972131877 is an apocalyptic number.

It is an amenable number.

7972131877 is a deficient number, since it is larger than the sum of its proper divisors (25148999).

7972131877 is a wasteful number, since it uses less digits than its factorization.

7972131877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25148998.

The product of its digits is 1037232, while the sum is 52.

The square root of 7972131877 is about 89286.7956475088. The cubic root of 7972131877 is about 1997.6749545459.

The spelling of 7972131877 in words is "seven billion, nine hundred seventy-two million, one hundred thirty-one thousand, eight hundred seventy-seven".