253618643 has 4 divisors (see below), whose sum is σ = 253694040. Its totient is φ = 253543248.

The previous prime is 253618559. The next prime is 253618679. The reversal of 253618643 is 346816352.

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 253618643 - 2¹² = 253614547 is a prime.

It is a super-2 number, since 2×253618643² = 128644832154322898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253618597 and 253618606.

It is not an unprimeable number, because it can be changed into a prime (253618943) 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, 32405 + ... + 39462.

It is an arithmetic number, because the mean of its divisors is an integer number (63423510).

Almost surely, 2^253618643 is an apocalyptic number.

253618643 is a deficient number, since it is larger than the sum of its proper divisors (75397).

253618643 is an equidigital number, since it uses as much as digits as its factorization.

253618643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75396.

The product of its digits is 103680, while the sum is 38.

The square root of 253618643 is about 15925.4087231694. The cubic root of 253618643 is about 632.9854464001.

The spelling of 253618643 in words is "two hundred fifty-three million, six hundred eighteen thousand, six hundred forty-three".