231277576781 has 2 divisors, whose sum is σ = 231277576782. Its totient is φ = 231277576780.

The previous prime is 231277576753. The next prime is 231277576799. The reversal of 231277576781 is 187675772132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167063482756 + 64214094025 = 408734^2 + 253405^2 .

It is a cyclic number.

It is not a de Polignac number, because 231277576781 - 2²² = 231273382477 is a prime.

It is a super-4 number, since 4×231277576781⁴ (a number of 47 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231277576081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115638788390 + 115638788391.

It is an arithmetic number, because the mean of its divisors is an integer number (115638788391).

Almost surely, 2^231277576781 is an apocalyptic number.

It is an amenable number.

231277576781 is a deficient number, since it is larger than the sum of its proper divisors (1).

231277576781 is an equidigital number, since it uses as much as digits as its factorization.

231277576781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6914880, while the sum is 56.

The spelling of 231277576781 in words is "two hundred thirty-one billion, two hundred seventy-seven million, five hundred seventy-six thousand, seven hundred eighty-one".