225021131 has 4 divisors (see below), whose sum is σ = 228710064. Its totient is φ = 221332200.

The previous prime is 225021109. The next prime is 225021143. The reversal of 225021131 is 131120522.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 225021131 - 2⁶ = 225021067 is a prime.

It is a super-2 number, since 2×225021131² = 101269018793038322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225021331) 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, 1844375 + ... + 1844496.

It is an arithmetic number, because the mean of its divisors is an integer number (57177516).

Almost surely, 2^225021131 is an apocalyptic number.

225021131 is a deficient number, since it is larger than the sum of its proper divisors (3688933).

225021131 is an equidigital number, since it uses as much as digits as its factorization.

225021131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688932.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 225021131 is about 15000.7043501297. The cubic root of 225021131 is about 608.2392394073.

Adding to 225021131 its reverse (131120522), we get a palindrome (356141653).

The spelling of 225021131 in words is "two hundred twenty-five million, twenty-one thousand, one hundred thirty-one".