631556055901 has 2 divisors, whose sum is σ = 631556055902. Its totient is φ = 631556055900.

The previous prime is 631556055883. The next prime is 631556055931. The reversal of 631556055901 is 109550655136.

631556055901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595596519001 + 35959536900 = 771749^2 + 189630^2 .

It is a cyclic number.

It is not a de Polignac number, because 631556055901 - 2³⁷ = 494117102429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631556055931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315778027950 + 315778027951.

It is an arithmetic number, because the mean of its divisors is an integer number (315778027951).

Almost surely, 2^631556055901 is an apocalyptic number.

It is an amenable number.

631556055901 is a deficient number, since it is larger than the sum of its proper divisors (1).

631556055901 is an equidigital number, since it uses as much as digits as its factorization.

631556055901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 607500, while the sum is 46.

The spelling of 631556055901 in words is "six hundred thirty-one billion, five hundred fifty-six million, fifty-five thousand, nine hundred one".