225450621 has 40 divisors (see below), whose sum is σ = 368900928. Its totient is φ = 136080000.

The previous prime is 225450619. The next prime is 225450629. The reversal of 225450621 is 126054522.

It is not a de Polignac number, because 225450621 - 2¹ = 225450619 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225450629) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 356976 + ... + 357606.

Almost surely, 2^225450621 is an apocalyptic number.

It is an amenable number.

225450621 is a deficient number, since it is larger than the sum of its proper divisors (143450307).

225450621 is a wasteful number, since it uses less digits than its factorization.

225450621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055 (or 1046 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 225450621 is about 15015.0131868074. The cubic root of 225450621 is about 608.6259684875.

The spelling of 225450621 in words is "two hundred twenty-five million, four hundred fifty thousand, six hundred twenty-one".