631281565025 has 24 divisors (see below), whose sum is σ = 805455539064. Its totient is φ = 490590464000.

The previous prime is 631281564997. The next prime is 631281565039. The reversal of 631281565025 is 520565182136.

It is a happy number.

631281565025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 90486054481 + 540795510544 = 300809^2 + 735388^2 .

It is not a de Polignac number, because 631281565025 - 2¹⁶ = 631281499489 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2224784 + ... + 2492433.

It is an arithmetic number, because the mean of its divisors is an integer number (33560647461).

Almost surely, 2^631281565025 is an apocalyptic number.

It is an amenable number.

631281565025 is a deficient number, since it is larger than the sum of its proper divisors (174173974039).

631281565025 is a wasteful number, since it uses less digits than its factorization.

631281565025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4717381 (or 4717376 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 44.

The spelling of 631281565025 in words is "six hundred thirty-one billion, two hundred eighty-one million, five hundred sixty-five thousand, twenty-five".