13436531887 has 2 divisors, whose sum is σ = 13436531888. Its totient is φ = 13436531886.

The previous prime is 13436531881. The next prime is 13436531947. The reversal of 13436531887 is 78813563431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13436531887 - 2²³ = 13428143279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13436531887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13436531881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6718265943 + 6718265944.

It is an arithmetic number, because the mean of its divisors is an integer number (6718265944).

Almost surely, 2^13436531887 is an apocalyptic number.

13436531887 is a deficient number, since it is larger than the sum of its proper divisors (1).

13436531887 is an equidigital number, since it uses as much as digits as its factorization.

13436531887 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 13436531887 in words is "thirteen billion, four hundred thirty-six million, five hundred thirty-one thousand, eight hundred eighty-seven".