253641643 has 4 divisors (see below), whose sum is σ = 253922200. Its totient is φ = 253361088.

The previous prime is 253641629. The next prime is 253641653. The reversal of 253641643 is 346146352.

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 253641643 - 2⁵ = 253641611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253641599 and 253641608.

It is not an unprimeable number, because it can be changed into a prime (253641613) 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, 138918 + ... + 140731.

It is an arithmetic number, because the mean of its divisors is an integer number (63480550).

Almost surely, 2^253641643 is an apocalyptic number.

253641643 is a deficient number, since it is larger than the sum of its proper divisors (280557).

253641643 is an equidigital number, since it uses as much as digits as its factorization.

253641643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280556.

The product of its digits is 51840, while the sum is 34.

The square root of 253641643 is about 15926.1308232728. The cubic root of 253641643 is about 633.0045804104.

Adding to 253641643 its reverse (346146352), we get a palindrome (599787995).

The spelling of 253641643 in words is "two hundred fifty-three million, six hundred forty-one thousand, six hundred forty-three".