863631225 has 72 divisors (see below), whose sum is σ = 1636502400. Its totient is φ = 434160000.

The previous prime is 863631137. The next prime is 863631277. The reversal of 863631225 is 522136368.

It is a happy number.

863631225 is a `hidden beast` number, since 8 + 636 + 3 + 12 + 2 + 5 = 666.

It is not a de Polignac number, because 863631225 - 2¹⁸ = 863369081 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 863631225.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1149600 + ... + 1150350.

It is an arithmetic number, because the mean of its divisors is an integer number (22729200).

Almost surely, 2^863631225 is an apocalyptic number.

It is an amenable number.

863631225 is a deficient number, since it is larger than the sum of its proper divisors (772871175).

863631225 is a wasteful number, since it uses less digits than its factorization.

863631225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055 (or 1047 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 863631225 is about 29387.6032537531. The cubic root of 863631225 is about 952.3051040677.

The spelling of 863631225 in words is "eight hundred sixty-three million, six hundred thirty-one thousand, two hundred twenty-five".