225437621 has 4 divisors (see below), whose sum is σ = 225468972. Its totient is φ = 225406272.

The previous prime is 225437617. The next prime is 225437669. The reversal of 225437621 is 126734522.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 131560900 + 93876721 = 11470^2 + 9689^2 .

It is a cyclic number.

It is not a de Polignac number, because 225437621 - 2² = 225437617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225437321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085 + ... + 21261.

It is an arithmetic number, because the mean of its divisors is an integer number (56367243).

Almost surely, 2^225437621 is an apocalyptic number.

It is an amenable number.

225437621 is a deficient number, since it is larger than the sum of its proper divisors (31351).

225437621 is a wasteful number, since it uses less digits than its factorization.

225437621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31350.

The product of its digits is 20160, while the sum is 32.

The square root of 225437621 is about 15014.5802805140. The cubic root of 225437621 is about 608.6142700061.

The spelling of 225437621 in words is "two hundred twenty-five million, four hundred thirty-seven thousand, six hundred twenty-one".