225520551 has 16 divisors (see below), whose sum is σ = 336042720. Its totient is φ = 149474880.

The previous prime is 225520511. The next prime is 225520573. The reversal of 225520551 is 155025522.

It is not a de Polignac number, because 225520551 - 2⁹ = 225520039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225520511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19470 + ... + 28811.

It is an arithmetic number, because the mean of its divisors is an integer number (21002670).

Almost surely, 2^225520551 is an apocalyptic number.

225520551 is a deficient number, since it is larger than the sum of its proper divisors (110522169).

225520551 is a wasteful number, since it uses less digits than its factorization.

225520551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48463 (or 48457 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 225520551 is about 15017.3416755430. The cubic root of 225520551 is about 608.6888896037.

The spelling of 225520551 in words is "two hundred twenty-five million, five hundred twenty thousand, five hundred fifty-one".