3991254131 has 2 divisors, whose sum is σ = 3991254132. Its totient is φ = 3991254130.

The previous prime is 3991254097. The next prime is 3991254149. The reversal of 3991254131 is 1314521993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3991254131 is a prime.

It is a super-2 number, since 2×3991254131² = 31860219076449130322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3991254151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995627065 + 1995627066.

It is an arithmetic number, because the mean of its divisors is an integer number (1995627066).

Almost surely, 2^3991254131 is an apocalyptic number.

3991254131 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991254131 is an equidigital number, since it uses as much as digits as its factorization.

3991254131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 38.

The square root of 3991254131 is about 63176.3732023294. The cubic root of 3991254131 is about 1586.2432742725.

The spelling of 3991254131 in words is "three billion, nine hundred ninety-one million, two hundred fifty-four thousand, one hundred thirty-one".