225320831 has 2 divisors, whose sum is σ = 225320832. Its totient is φ = 225320830.

The previous prime is 225320819. The next prime is 225320833. The reversal of 225320831 is 138023522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 225320831 - 2²² = 221126527 is a prime.

It is a super-2 number, since 2×225320831² = 101538953765061122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 225320833, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225320831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225320833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112660415 + 112660416.

It is an arithmetic number, because the mean of its divisors is an integer number (112660416).

Almost surely, 2^225320831 is an apocalyptic number.

225320831 is a deficient number, since it is larger than the sum of its proper divisors (1).

225320831 is an equidigital number, since it uses as much as digits as its factorization.

225320831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 225320831 is about 15010.6905570663. The cubic root of 225320831 is about 608.5091524746.

The spelling of 225320831 in words is "two hundred twenty-five million, three hundred twenty thousand, eight hundred thirty-one".