253231999 has 4 divisors (see below), whose sum is σ = 253275064. Its totient is φ = 253188936.

The previous prime is 253231991. The next prime is 253232003. The reversal of 253231999 is 999132352.

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 253231999 - 2³ = 253231991 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 (253231991) 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, 10992 + ... + 25045.

It is an arithmetic number, because the mean of its divisors is an integer number (63318766).

Almost surely, 2^253231999 is an apocalyptic number.

253231999 is a deficient number, since it is larger than the sum of its proper divisors (43065).

253231999 is an equidigital number, since it uses as much as digits as its factorization.

253231999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43064.

The product of its digits is 131220, while the sum is 43.

The square root of 253231999 is about 15913.2648755684. The cubic root of 253231999 is about 632.6636187182.

The spelling of 253231999 in words is "two hundred fifty-three million, two hundred thirty-one thousand, nine hundred ninety-nine".