253918081 has 4 divisors (see below), whose sum is σ = 257494464. Its totient is φ = 250341700.

The previous prime is 253918079. The next prime is 253918097. The reversal of 253918081 is 180819352.

253918081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 253918081 - 2¹ = 253918079 is a prime.

It is a super-2 number, since 2×253918081² = 128948783717445122, which contains 22 as substring.

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 253918081.

It is not an unprimeable number, because it can be changed into a prime (253918981) 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, 1788085 + ... + 1788226.

It is an arithmetic number, because the mean of its divisors is an integer number (64373616).

Almost surely, 2^253918081 is an apocalyptic number.

It is an amenable number.

253918081 is a deficient number, since it is larger than the sum of its proper divisors (3576383).

253918081 is an equidigital number, since it uses as much as digits as its factorization.

253918081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3576382.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 253918081 is about 15934.8072156522. The cubic root of 253918081 is about 633.2344624668.

The spelling of 253918081 in words is "two hundred fifty-three million, nine hundred eighteen thousand, eighty-one".