81282577631 has 2 divisors, whose sum is σ = 81282577632. Its totient is φ = 81282577630.

The previous prime is 81282577601. The next prime is 81282577669. The reversal of 81282577631 is 13677528218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81282577631 - 2¹⁰ = 81282576607 is a prime.

It is a super-2 number, since 2×81282577631² (a number of 23 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 81282577631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81282577601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40641288815 + 40641288816.

It is an arithmetic number, because the mean of its divisors is an integer number (40641288816).

Almost surely, 2^81282577631 is an apocalyptic number.

81282577631 is a deficient number, since it is larger than the sum of its proper divisors (1).

81282577631 is an equidigital number, since it uses as much as digits as its factorization.

81282577631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 50.

The spelling of 81282577631 in words is "eighty-one billion, two hundred eighty-two million, five hundred seventy-seven thousand, six hundred thirty-one".