225537551 has 4 divisors (see below), whose sum is σ = 225655104. Its totient is φ = 225420000.

The previous prime is 225537539. The next prime is 225537569. The reversal of 225537551 is 155735522.

It is a happy number.

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-225537551 is a prime.

It is a super-2 number, since 2×225537551² = 101734373822155202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225539551) 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, 55850 + ... + 59751.

It is an arithmetic number, because the mean of its divisors is an integer number (56413776).

Almost surely, 2^225537551 is an apocalyptic number.

225537551 is a deficient number, since it is larger than the sum of its proper divisors (117553).

225537551 is a wasteful number, since it uses less digits than its factorization.

225537551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117552.

The product of its digits is 52500, while the sum is 35.

The square root of 225537551 is about 15017.9076771699. The cubic root of 225537551 is about 608.7041837770.

The spelling of 225537551 in words is "two hundred twenty-five million, five hundred thirty-seven thousand, five hundred fifty-one".