6187591961 has 2 divisors, whose sum is σ = 6187591962. Its totient is φ = 6187591960.

The previous prime is 6187591937. The next prime is 6187591967. The reversal of 6187591961 is 1691957816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4194505225 + 1993086736 = 64765^2 + 44644^2 .

It is a cyclic number.

It is not a de Polignac number, because 6187591961 - 2⁶ = 6187591897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6187591967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3093795980 + 3093795981.

It is an arithmetic number, because the mean of its divisors is an integer number (3093795981).

Almost surely, 2^6187591961 is an apocalyptic number.

It is an amenable number.

6187591961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6187591961 is an equidigital number, since it uses as much as digits as its factorization.

6187591961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 53.

The square root of 6187591961 is about 78661.2481530773. The cubic root of 6187591961 is about 1835.8642105286.

The spelling of 6187591961 in words is "six billion, one hundred eighty-seven million, five hundred ninety-one thousand, nine hundred sixty-one".