771639551231 has 2 divisors, whose sum is σ = 771639551232. Its totient is φ = 771639551230.

The previous prime is 771639551159. The next prime is 771639551239. The reversal of 771639551231 is 132155936177.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 771639551231 - 2³⁰ = 770565809407 is a prime.

It is a super-2 number, since 2×771639551231² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 771639551231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (771639551239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385819775615 + 385819775616.

It is an arithmetic number, because the mean of its divisors is an integer number (385819775616).

Almost surely, 2^771639551231 is an apocalyptic number.

771639551231 is a deficient number, since it is larger than the sum of its proper divisors (1).

771639551231 is an equidigital number, since it uses as much as digits as its factorization.

771639551231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1190700, while the sum is 50.

The spelling of 771639551231 in words is "seven hundred seventy-one billion, six hundred thirty-nine million, five hundred fifty-one thousand, two hundred thirty-one".