13521491261 has 2 divisors, whose sum is σ = 13521491262. Its totient is φ = 13521491260.

The previous prime is 13521491231. The next prime is 13521491287. The reversal of 13521491261 is 16219412531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12980044900 + 541446361 = 113930^2 + 23269^2 .

It is a cyclic number.

It is not a de Polignac number, because 13521491261 - 2⁶ = 13521491197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13521491201) 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, 6760745630 + 6760745631.

It is an arithmetic number, because the mean of its divisors is an integer number (6760745631).

Almost surely, 2^13521491261 is an apocalyptic number.

It is an amenable number.

13521491261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13521491261 is an equidigital number, since it uses as much as digits as its factorization.

13521491261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The spelling of 13521491261 in words is "thirteen billion, five hundred twenty-one million, four hundred ninety-one thousand, two hundred sixty-one".