13857843631 has 2 divisors, whose sum is σ = 13857843632. Its totient is φ = 13857843630.

The previous prime is 13857843617. The next prime is 13857843647. The reversal of 13857843631 is 13634875831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13857843631 - 2¹⁷ = 13857712559 is a prime.

It is a super-2 number, since 2×13857843631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13857843031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6928921815 + 6928921816.

It is an arithmetic number, because the mean of its divisors is an integer number (6928921816).

Almost surely, 2^13857843631 is an apocalyptic number.

13857843631 is a deficient number, since it is larger than the sum of its proper divisors (1).

13857843631 is an equidigital number, since it uses as much as digits as its factorization.

13857843631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 49.

The spelling of 13857843631 in words is "thirteen billion, eight hundred fifty-seven million, eight hundred forty-three thousand, six hundred thirty-one".