225511901 has 4 divisors (see below), whose sum is σ = 226815612. Its totient is φ = 224208192.

The previous prime is 225511889. The next prime is 225511903. The reversal of 225511901 is 109115522.

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

It can be written as a sum of positive squares in 2 ways, for example, as 196728676 + 28783225 = 14026^2 + 5365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225511901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225511903) 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, 651596 + ... + 651941.

It is an arithmetic number, because the mean of its divisors is an integer number (56703903).

Almost surely, 2^225511901 is an apocalyptic number.

It is an amenable number.

225511901 is a deficient number, since it is larger than the sum of its proper divisors (1303711).

225511901 is a wasteful number, since it uses less digits than its factorization.

225511901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303710.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 225511901 is about 15017.0536724086. The cubic root of 225511901 is about 608.6811072735.

The spelling of 225511901 in words is "two hundred twenty-five million, five hundred eleven thousand, nine hundred one".