225578999 has 4 divisors (see below), whose sum is σ = 228756240. Its totient is φ = 222401760.

The previous prime is 225578993. The next prime is 225579019. The reversal of 225578999 is 999875522.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225578999 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225578993) 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, 1588514 + ... + 1588655.

It is an arithmetic number, because the mean of its divisors is an integer number (57189060).

Almost surely, 2^225578999 is an apocalyptic number.

225578999 is a deficient number, since it is larger than the sum of its proper divisors (3177241).

225578999 is an equidigital number, since it uses as much as digits as its factorization.

225578999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3177240.

The product of its digits is 4082400, while the sum is 56.

The square root of 225578999 is about 15019.2875663262. The cubic root of 225578999 is about 608.7414695498.

The spelling of 225578999 in words is "two hundred twenty-five million, five hundred seventy-eight thousand, nine hundred ninety-nine".