13072720901 has 2 divisors, whose sum is σ = 13072720902. Its totient is φ = 13072720900.

The previous prime is 13072720873. The next prime is 13072720907. The reversal of 13072720901 is 10902727031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9579319876 + 3493401025 = 97874^2 + 59105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13072720901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13072720907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6536360450 + 6536360451.

It is an arithmetic number, because the mean of its divisors is an integer number (6536360451).

Almost surely, 2^13072720901 is an apocalyptic number.

It is an amenable number.

13072720901 is a deficient number, since it is larger than the sum of its proper divisors (1).

13072720901 is an equidigital number, since it uses as much as digits as its factorization.

13072720901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 32.

The spelling of 13072720901 in words is "thirteen billion, seventy-two million, seven hundred twenty thousand, nine hundred one".