6131320991 has 2 divisors, whose sum is σ = 6131320992. Its totient is φ = 6131320990.

The previous prime is 6131320927. The next prime is 6131321017. The reversal of 6131320991 is 1990231316.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6131320991 - 2⁶ = 6131320927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6131320291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3065660495 + 3065660496.

It is an arithmetic number, because the mean of its divisors is an integer number (3065660496).

Almost surely, 2^6131320991 is an apocalyptic number.

6131320991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6131320991 is an equidigital number, since it uses as much as digits as its factorization.

6131320991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 6131320991 is about 78302.7521291557. The cubic root of 6131320991 is about 1830.2820383083.

The spelling of 6131320991 in words is "six billion, one hundred thirty-one million, three hundred twenty thousand, nine hundred ninety-one".