13521402491 has 2 divisors, whose sum is σ = 13521402492. Its totient is φ = 13521402490.

The previous prime is 13521402487. The next prime is 13521402533. The reversal of 13521402491 is 19420412531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13521402491 - 2² = 13521402487 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (13521402431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6760701245 + 6760701246.

It is an arithmetic number, because the mean of its divisors is an integer number (6760701246).

Almost surely, 2^13521402491 is an apocalyptic number.

13521402491 is a deficient number, since it is larger than the sum of its proper divisors (1).

13521402491 is an equidigital number, since it uses as much as digits as its factorization.

13521402491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 13521402491 in words is "thirteen billion, five hundred twenty-one million, four hundred two thousand, four hundred ninety-one".