7131891631 has 2 divisors, whose sum is σ = 7131891632. Its totient is φ = 7131891630.

The previous prime is 7131891617. The next prime is 7131891703. The reversal of 7131891631 is 1361981317.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7131891631 is a prime.

It is a super-2 number, since 2×7131891631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7131891601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3565945815 + 3565945816.

It is an arithmetic number, because the mean of its divisors is an integer number (3565945816).

Almost surely, 2^7131891631 is an apocalyptic number.

7131891631 is a deficient number, since it is larger than the sum of its proper divisors (1).

7131891631 is an equidigital number, since it uses as much as digits as its factorization.

7131891631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 7131891631 is about 84450.5277129752. The cubic root of 7131891631 is about 1924.8707738967.

The spelling of 7131891631 in words is "seven billion, one hundred thirty-one million, eight hundred ninety-one thousand, six hundred thirty-one".