631427553 has 12 divisors (see below), whose sum is σ = 914244240. Its totient is φ = 419944536.

The previous prime is 631427519. The next prime is 631427591. The reversal of 631427553 is 355724136.

631427553 is a `hidden beast` number, since 63 + 1 + 42 + 7 + 553 = 666.

It is not a de Polignac number, because 631427553 - 2²² = 627233249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631427453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79951 + ... + 87492.

It is an arithmetic number, because the mean of its divisors is an integer number (76187020).

Almost surely, 2^631427553 is an apocalyptic number.

It is an amenable number.

631427553 is a deficient number, since it is larger than the sum of its proper divisors (282816687).

631427553 is a wasteful number, since it uses less digits than its factorization.

631427553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167868 (or 167865 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 631427553 is about 25128.2222411376. Note that the first 4 decimals coincide. The cubic root of 631427553 is about 857.9089060053.

The spelling of 631427553 in words is "six hundred thirty-one million, four hundred twenty-seven thousand, five hundred fifty-three".