253916191 has 4 divisors (see below), whose sum is σ = 257130400. Its totient is φ = 250701984.

The previous prime is 253916189. The next prime is 253916207. The reversal of 253916191 is 191619352.

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 253916191 - 2¹ = 253916189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 253916191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253916101) 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, 1606986 + ... + 1607143.

It is an arithmetic number, because the mean of its divisors is an integer number (64282600).

Almost surely, 2^253916191 is an apocalyptic number.

253916191 is a deficient number, since it is larger than the sum of its proper divisors (3214209).

253916191 is an equidigital number, since it uses as much as digits as its factorization.

253916191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214208.

The product of its digits is 14580, while the sum is 37.

The square root of 253916191 is about 15934.7479114042. The cubic root of 253916191 is about 633.2328913353.

The spelling of 253916191 in words is "two hundred fifty-three million, nine hundred sixteen thousand, one hundred ninety-one".