225215431 has 4 divisors (see below), whose sum is σ = 257389072. Its totient is φ = 193041792.

The previous prime is 225215429. The next prime is 225215453. The reversal of 225215431 is 134512522.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 225215431 - 2¹ = 225215429 is a prime.

It is a super-2 number, since 2×225215431² = 101443980721031522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 225215396 and 225215405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225215461) 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, 16086810 + ... + 16086823.

It is an arithmetic number, because the mean of its divisors is an integer number (64347268).

Almost surely, 2^225215431 is an apocalyptic number.

225215431 is a deficient number, since it is larger than the sum of its proper divisors (32173641).

225215431 is an equidigital number, since it uses as much as digits as its factorization.

225215431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32173640.

The product of its digits is 2400, while the sum is 25.

The square root of 225215431 is about 15007.1793152478. The cubic root of 225215431 is about 608.4142553930.

Adding to 225215431 its reverse (134512522), we get a palindrome (359727953).

The spelling of 225215431 in words is "two hundred twenty-five million, two hundred fifteen thousand, four hundred thirty-one".