631070358781 has 2 divisors, whose sum is σ = 631070358782. Its totient is φ = 631070358780.

The previous prime is 631070358701. The next prime is 631070358797. The reversal of 631070358781 is 187853070136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 423617437881 + 207452920900 = 650859^2 + 455470^2 .

It is a cyclic number.

It is not a de Polignac number, because 631070358781 - 2³⁹ = 81314544893 is a prime.

It is a super-2 number, since 2×631070358781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631070358701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315535179390 + 315535179391.

It is an arithmetic number, because the mean of its divisors is an integer number (315535179391).

Almost surely, 2^631070358781 is an apocalyptic number.

It is an amenable number.

631070358781 is a deficient number, since it is larger than the sum of its proper divisors (1).

631070358781 is an equidigital number, since it uses as much as digits as its factorization.

631070358781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 631070358781 in words is "six hundred thirty-one billion, seventy million, three hundred fifty-eight thousand, seven hundred eighty-one".