225401631 has 16 divisors (see below), whose sum is σ = 369890304. Its totient is φ = 118893024.

The previous prime is 225401597. The next prime is 225401639. The reversal of 225401631 is 136104522.

It is not a de Polignac number, because 225401631 - 2⁹ = 225401119 is a prime.

It is a super-2 number, since 2×225401631² = 101611790514920322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225401639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412551 + ... + 413096.

It is an arithmetic number, because the mean of its divisors is an integer number (23118144).

Almost surely, 2^225401631 is an apocalyptic number.

225401631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

225401631 is a deficient number, since it is larger than the sum of its proper divisors (144488673).

225401631 is a wasteful number, since it uses less digits than its factorization.

225401631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825670.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 225401631 is about 15013.3817309759. The cubic root of 225401631 is about 608.5818808642.

It can be divided in two parts, 225 and 401631, that added together give a triangular number (401856 = T₈₉₆).

The spelling of 225401631 in words is "two hundred twenty-five million, four hundred one thousand, six hundred thirty-one".