253421671631 has 4 divisors (see below), whose sum is σ = 253471377000. Its totient is φ = 253371966264.

The previous prime is 253421671553. The next prime is 253421671681. The reversal of 253421671631 is 136176124352.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253421671631 is a prime.

It is a super-2 number, since 2×253421671631² (a number of 24 digits) 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 (253421671681) 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, 24845036 + ... + 24855233.

It is an arithmetic number, because the mean of its divisors is an integer number (63367844250).

Almost surely, 2^253421671631 is an apocalyptic number.

253421671631 is a deficient number, since it is larger than the sum of its proper divisors (49705369).

253421671631 is an equidigital number, since it uses as much as digits as its factorization.

253421671631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49705368.

The product of its digits is 181440, while the sum is 41.

Adding to 253421671631 its reverse (136176124352), we get a palindrome (389597795983).

The spelling of 253421671631 in words is "two hundred fifty-three billion, four hundred twenty-one million, six hundred seventy-one thousand, six hundred thirty-one".