13015121909 has 2 divisors, whose sum is σ = 13015121910. Its totient is φ = 13015121908.

The previous prime is 13015121881. The next prime is 13015121971. The reversal of 13015121909 is 90912151031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12293930884 + 721191025 = 110878^2 + 26855^2 .

It is a cyclic number.

It is not a de Polignac number, because 13015121909 - 2⁸ = 13015121653 is a prime.

It is a super-2 number, since 2×13015121909² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13015121209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6507560954 + 6507560955.

It is an arithmetic number, because the mean of its divisors is an integer number (6507560955).

Almost surely, 2^13015121909 is an apocalyptic number.

It is an amenable number.

13015121909 is a deficient number, since it is larger than the sum of its proper divisors (1).

13015121909 is an equidigital number, since it uses as much as digits as its factorization.

13015121909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 32.

The spelling of 13015121909 in words is "thirteen billion, fifteen million, one hundred twenty-one thousand, nine hundred nine".