225251631 has 64 divisors (see below), whose sum is σ = 387072000. Its totient is φ = 128031840.

The previous prime is 225251603. The next prime is 225251657. The reversal of 225251631 is 136152522.

It is a happy number.

225251631 is a `hidden beast` number, since 2 + 2 + 5 + 25 + 1 + 631 = 666.

It is not a de Polignac number, because 225251631 - 2⁷ = 225251503 is a prime.

It is a super-2 number, since 2×225251631² = 101476594536320322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 225251595 and 225251604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225251681) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1009986 + ... + 1010208.

It is an arithmetic number, because the mean of its divisors is an integer number (6048000).

Almost surely, 2^225251631 is an apocalyptic number.

225251631 is a deficient number, since it is larger than the sum of its proper divisors (161820369).

225251631 is a wasteful number, since it uses less digits than its factorization.

225251631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 435 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 225251631 is about 15008.3853561934. The cubic root of 225251631 is about 608.4468514663.

The spelling of 225251631 in words is "two hundred twenty-five million, two hundred fifty-one thousand, six hundred thirty-one".