253911491 has 4 divisors (see below), whose sum is σ = 254221584. Its totient is φ = 253601400.

The previous prime is 253911487. The next prime is 253911503. The reversal of 253911491 is 194119352.

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 253911491 - 2² = 253911487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253911461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153815 + ... + 155456.

It is an arithmetic number, because the mean of its divisors is an integer number (63555396).

Almost surely, 2^253911491 is an apocalyptic number.

253911491 is a deficient number, since it is larger than the sum of its proper divisors (310093).

253911491 is an equidigital number, since it uses as much as digits as its factorization.

253911491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310092.

The product of its digits is 9720, while the sum is 35.

The square root of 253911491 is about 15934.6004342751. The cubic root of 253911491 is about 633.2289842548.

The spelling of 253911491 in words is "two hundred fifty-three million, nine hundred eleven thousand, four hundred ninety-one".