2511761591 has 2 divisors, whose sum is σ = 2511761592. Its totient is φ = 2511761590.

The previous prime is 2511761507. The next prime is 2511761599. The reversal of 2511761591 is 1951671152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2511761591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2511761599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1255880795 + 1255880796.

It is an arithmetic number, because the mean of its divisors is an integer number (1255880796).

Almost surely, 2^2511761591 is an apocalyptic number.

2511761591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2511761591 is an equidigital number, since it uses as much as digits as its factorization.

2511761591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 38.

The square root of 2511761591 is about 50117.4778994315. The cubic root of 2511761591 is about 1359.3338705456. Note that the first 3 decimals are identical.

The spelling of 2511761591 in words is "two billion, five hundred eleven million, seven hundred sixty-one thousand, five hundred ninety-one".