225891506 has 4 divisors (see below), whose sum is σ = 338837262. Its totient is φ = 112945752.

The previous prime is 225891503. The next prime is 225891511. The reversal of 225891506 is 605198522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605198522 = 2 ⋅302599261.

It can be written as a sum of positive squares in only one way, i.e., 132595225 + 93296281 = 11515^2 + 9659^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 225891506.

It is not an unprimeable number, because it can be changed into a prime (225891503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56472875 + ... + 56472878.

Almost surely, 2^225891506 is an apocalyptic number.

225891506 is a deficient number, since it is larger than the sum of its proper divisors (112945756).

225891506 is a wasteful number, since it uses less digits than its factorization.

225891506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112945755.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 225891506 is about 15029.6874884343. The cubic root of 225891506 is about 609.0224475230.

The spelling of 225891506 in words is "two hundred twenty-five million, eight hundred ninety-one thousand, five hundred six".