253665231 has 4 divisors (see below), whose sum is σ = 338220312. Its totient is φ = 169110152.

The previous prime is 253665187. The next prime is 253665239. The reversal of 253665231 is 132566352.

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 253665231 - 2¹⁰ = 253664207 is a prime.

It is a super-2 number, since 2×253665231² = 128692098836566722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 253665192 and 253665201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253665239) 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, 42277536 + ... + 42277541.

It is an arithmetic number, because the mean of its divisors is an integer number (84555078).

Almost surely, 2^253665231 is an apocalyptic number.

253665231 is a deficient number, since it is larger than the sum of its proper divisors (84555081).

253665231 is an equidigital number, since it uses as much as digits as its factorization.

253665231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84555080.

The product of its digits is 32400, while the sum is 33.

The square root of 253665231 is about 15926.8713500172. The cubic root of 253665231 is about 633.0242023844.

The spelling of 253665231 in words is "two hundred fifty-three million, six hundred sixty-five thousand, two hundred thirty-one".