631022681 has 2 divisors, whose sum is σ = 631022682. Its totient is φ = 631022680.

The previous prime is 631022671. The next prime is 631022723. The reversal of 631022681 is 186220136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631014400 + 8281 = 25120^2 + 91^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631022681 is a prime.

It is a super-2 number, since 2×631022681² = 796379247872855522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (631022671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315511340 + 315511341.

It is an arithmetic number, because the mean of its divisors is an integer number (315511341).

Almost surely, 2^631022681 is an apocalyptic number.

It is an amenable number.

631022681 is a deficient number, since it is larger than the sum of its proper divisors (1).

631022681 is an equidigital number, since it uses as much as digits as its factorization.

631022681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 631022681 is about 25120.1648282809. The cubic root of 631022681 is about 857.7255027743.

The spelling of 631022681 in words is "six hundred thirty-one million, twenty-two thousand, six hundred eighty-one".