225120531 has 16 divisors (see below), whose sum is σ = 316310400. Its totient is φ = 142023168.

The previous prime is 225120503. The next prime is 225120551. The reversal of 225120531 is 135021522.

It is not a de Polignac number, because 225120531 - 2⁹ = 225120019 is a prime.

It is a super-2 number, since 2×225120531² = 101358506955443922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 225120498 and 225120507.

It is not an unprimeable number, because it can be changed into a prime (225120551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70195 + ... + 73331.

It is an arithmetic number, because the mean of its divisors is an integer number (19769400).

Almost surely, 2^225120531 is an apocalyptic number.

225120531 is a deficient number, since it is larger than the sum of its proper divisors (91189869).

225120531 is a wasteful number, since it uses less digits than its factorization.

225120531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4418.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 225120531 is about 15004.0171620803. The cubic root of 225120531 is about 608.3287866719.

Subtracting from 225120531 its reverse (135021522), we obtain a palindrome (90099009).

The spelling of 225120531 in words is "two hundred twenty-five million, one hundred twenty thousand, five hundred thirty-one".