13531781957 has 2 divisors, whose sum is σ = 13531781958. Its totient is φ = 13531781956.

The previous prime is 13531781927. The next prime is 13531782023. The reversal of 13531781957 is 75918713531.

13531781957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13531738276 + 43681 = 116326^2 + 209^2 .

It is a cyclic number.

It is not a de Polignac number, because 13531781957 - 2²² = 13527587653 is a prime.

It is a super-3 number, since 3×13531781957³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13531781917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765890978 + 6765890979.

It is an arithmetic number, because the mean of its divisors is an integer number (6765890979).

Almost surely, 2^13531781957 is an apocalyptic number.

It is an amenable number.

13531781957 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531781957 is an equidigital number, since it uses as much as digits as its factorization.

13531781957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 793800, while the sum is 50.

The spelling of 13531781957 in words is "thirteen billion, five hundred thirty-one million, seven hundred eighty-one thousand, nine hundred fifty-seven".