253490991 has 16 divisors (see below), whose sum is σ = 364277760. Its totient is φ = 155869920.

The previous prime is 253490971. The next prime is 253491019. The reversal of 253490991 is 199094352.

It is not a de Polignac number, because 253490991 - 2¹¹ = 253488943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253490921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80790 + ... + 83868.

It is an arithmetic number, because the mean of its divisors is an integer number (22767360).

Almost surely, 2^253490991 is an apocalyptic number.

253490991 is a deficient number, since it is larger than the sum of its proper divisors (110786769).

253490991 is a wasteful number, since it uses less digits than its factorization.

253490991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5206.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 253490991 is about 15921.4004095117. The cubic root of 253490991 is about 632.8792299465.

The spelling of 253490991 in words is "two hundred fifty-three million, four hundred ninety thousand, nine hundred ninety-one".