631781460251 has 2 divisors, whose sum is σ = 631781460252. Its totient is φ = 631781460250.

The previous prime is 631781460221. The next prime is 631781460347. The reversal of 631781460251 is 152064187136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631781460251 - 2¹⁰ = 631781459227 is a prime.

It is not a weakly prime, because it can be changed into another prime (631781460221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315890730125 + 315890730126.

It is an arithmetic number, because the mean of its divisors is an integer number (315890730126).

Almost surely, 2^631781460251 is an apocalyptic number.

631781460251 is a deficient number, since it is larger than the sum of its proper divisors (1).

631781460251 is an equidigital number, since it uses as much as digits as its factorization.

631781460251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 631781460251 in words is "six hundred thirty-one billion, seven hundred eighty-one million, four hundred sixty thousand, two hundred fifty-one".