13698921491 has 2 divisors, whose sum is σ = 13698921492. Its totient is φ = 13698921490.

The previous prime is 13698921449. The next prime is 13698921527. The reversal of 13698921491 is 19412989631.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13698921491 is a prime.

It is not a weakly prime, because it can be changed into another prime (13698921091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6849460745 + 6849460746.

It is an arithmetic number, because the mean of its divisors is an integer number (6849460746).

Almost surely, 2^13698921491 is an apocalyptic number.

13698921491 is a deficient number, since it is larger than the sum of its proper divisors (1).

13698921491 is an equidigital number, since it uses as much as digits as its factorization.

13698921491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 53.

The spelling of 13698921491 in words is "thirteen billion, six hundred ninety-eight million, nine hundred twenty-one thousand, four hundred ninety-one".