3971799531 has 24 divisors (see below), whose sum is σ = 6696129024. Its totient is φ = 2221308720.

The previous prime is 3971799499. The next prime is 3971799541. The reversal of 3971799531 is 1359971793.

It is a happy number.

3971799531 is a `hidden beast` number, since 3 + 9 + 7 + 17 + 99 + 531 = 666.

It is not a de Polignac number, because 3971799531 - 2⁵ = 3971799499 is a prime.

It is a super-2 number, since 2×3971799531² = 31550383028903639922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3971799541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 667725 + ... + 673646.

It is an arithmetic number, because the mean of its divisors is an integer number (279005376).

Almost surely, 2^3971799531 is an apocalyptic number.

3971799531 is a deficient number, since it is larger than the sum of its proper divisors (2724329493).

3971799531 is a wasteful number, since it uses less digits than its factorization.

3971799531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341431 (or 1341428 counting only the distinct ones).

The product of its digits is 1607445, while the sum is 54.

The square root of 3971799531 is about 63022.2145834308. The cubic root of 3971799531 is about 1583.6617962422.

The spelling of 3971799531 in words is "three billion, nine hundred seventy-one million, seven hundred ninety-nine thousand, five hundred thirty-one".