13391601961 has 2 divisors, whose sum is σ = 13391601962. Its totient is φ = 13391601960.

The previous prime is 13391601901. The next prime is 13391601973. The reversal of 13391601961 is 16910619331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9628515625 + 3763086336 = 98125^2 + 61344^2 .

It is a cyclic number.

It is not a de Polignac number, because 13391601961 - 2¹¹ = 13391599913 is a prime.

It is not a weakly prime, because it can be changed into another prime (13391601901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6695800980 + 6695800981.

It is an arithmetic number, because the mean of its divisors is an integer number (6695800981).

Almost surely, 2^13391601961 is an apocalyptic number.

It is an amenable number.

13391601961 is a deficient number, since it is larger than the sum of its proper divisors (1).

13391601961 is an equidigital number, since it uses as much as digits as its factorization.

13391601961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 40.

The spelling of 13391601961 in words is "thirteen billion, three hundred ninety-one million, six hundred one thousand, nine hundred sixty-one".