225266621 has 2 divisors, whose sum is σ = 225266622. Its totient is φ = 225266620.

The previous prime is 225266581. The next prime is 225266633. The reversal of 225266621 is 126662522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222427396 + 2839225 = 14914^2 + 1685^2 .

It is a cyclic number.

It is not a de Polignac number, because 225266621 - 2¹⁴ = 225250237 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225266651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112633310 + 112633311.

It is an arithmetic number, because the mean of its divisors is an integer number (112633311).

Almost surely, 2^225266621 is an apocalyptic number.

It is an amenable number.

225266621 is a deficient number, since it is larger than the sum of its proper divisors (1).

225266621 is an equidigital number, since it uses as much as digits as its factorization.

225266621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 225266621 is about 15008.8847353826. The cubic root of 225266621 is about 608.4603480996.

The spelling of 225266621 in words is "two hundred twenty-five million, two hundred sixty-six thousand, six hundred twenty-one".