225351531 has 8 divisors (see below), whose sum is σ = 333854160. Its totient is φ = 150234336.

The previous prime is 225351527. The next prime is 225351569. The reversal of 225351531 is 135153522.

It is a happy number.

225351531 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 225351531 - 2² = 225351527 is a prime.

It is a super-2 number, since 2×225351531² = 101566625048087922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8346353 = 225351531 / (2 + 2 + 5 + 3 + 5 + 1 + 5 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 225351495 and 225351504.

It is not an unprimeable number, because it can be changed into a prime (225352531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4173150 + ... + 4173203.

It is an arithmetic number, because the mean of its divisors is an integer number (41731770).

Almost surely, 2^225351531 is an apocalyptic number.

225351531 is a deficient number, since it is larger than the sum of its proper divisors (108502629).

225351531 is an equidigital number, since it uses as much as digits as its factorization.

225351531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8346362 (or 8346356 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 225351531 is about 15011.7131267554. The cubic root of 225351531 is about 608.5367877100.

The spelling of 225351531 in words is "two hundred twenty-five million, three hundred fifty-one thousand, five hundred thirty-one".