13931542661 has 2 divisors, whose sum is σ = 13931542662. Its totient is φ = 13931542660.

The previous prime is 13931542649. The next prime is 13931542679. The reversal of 13931542661 is 16624513931.

It is a happy number.

13931542661 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., 13457392036 + 474150625 = 116006^2 + 21775^2 .

It is a cyclic number.

It is not a de Polignac number, because 13931542661 - 2¹⁴ = 13931526277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13931542601) 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, 6965771330 + 6965771331.

It is an arithmetic number, because the mean of its divisors is an integer number (6965771331).

Almost surely, 2^13931542661 is an apocalyptic number.

It is an amenable number.

13931542661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13931542661 is an equidigital number, since it uses as much as digits as its factorization.

13931542661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The spelling of 13931542661 in words is "thirteen billion, nine hundred thirty-one million, five hundred forty-two thousand, six hundred sixty-one".