771132638831 has 2 divisors, whose sum is σ = 771132638832. Its totient is φ = 771132638830.

The previous prime is 771132638791. The next prime is 771132638849. The reversal of 771132638831 is 138836231177.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-771132638831 is a prime.

It is a super-2 number, since 2×771132638831² (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 771132638831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (771132638891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385566319415 + 385566319416.

It is an arithmetic number, because the mean of its divisors is an integer number (385566319416).

Almost surely, 2^771132638831 is an apocalyptic number.

771132638831 is a deficient number, since it is larger than the sum of its proper divisors (1).

771132638831 is an equidigital number, since it uses as much as digits as its factorization.

771132638831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The spelling of 771132638831 in words is "seven hundred seventy-one billion, one hundred thirty-two million, six hundred thirty-eight thousand, eight hundred thirty-one".