2611255991 has 2 divisors, whose sum is σ = 2611255992. Its totient is φ = 2611255990.

The previous prime is 2611255973. The next prime is 2611256027. The reversal of 2611255991 is 1995521162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2611255991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2611255951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1305627995 + 1305627996.

It is an arithmetic number, because the mean of its divisors is an integer number (1305627996).

Almost surely, 2^2611255991 is an apocalyptic number.

2611255991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2611255991 is an equidigital number, since it uses as much as digits as its factorization.

2611255991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 41.

The square root of 2611255991 is about 51100.4500078033. The cubic root of 2611255991 is about 1377.0503389681.

The spelling of 2611255991 in words is "two billion, six hundred eleven million, two hundred fifty-five thousand, nine hundred ninety-one".