253911621 has 4 divisors (see below), whose sum is σ = 338548832. Its totient is φ = 169274412.

The previous prime is 253911601. The next prime is 253911629. The reversal of 253911621 is 126119352.

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 not a de Polignac number, because 253911621 - 2⁵ = 253911589 is a prime.

It is a super-2 number, since 2×253911621² = 128942222557695282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253911629) 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, 42318601 + ... + 42318606.

It is an arithmetic number, because the mean of its divisors is an integer number (84637208).

Almost surely, 2^253911621 is an apocalyptic number.

It is an amenable number.

253911621 is a deficient number, since it is larger than the sum of its proper divisors (84637211).

253911621 is an equidigital number, since it uses as much as digits as its factorization.

253911621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84637210.

The product of its digits is 3240, while the sum is 30.

The square root of 253911621 is about 15934.6045134481. The cubic root of 253911621 is about 633.2290923236.

The spelling of 253911621 in words is "two hundred fifty-three million, nine hundred eleven thousand, six hundred twenty-one".