13515031109 has 2 divisors, whose sum is σ = 13515031110. Its totient is φ = 13515031108.

The previous prime is 13515031073. The next prime is 13515031133. The reversal of 13515031109 is 90113051531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13242946084 + 272085025 = 115078^2 + 16495^2 .

It is a cyclic number.

It is not a de Polignac number, because 13515031109 - 2⁸ = 13515030853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13515031139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6757515554 + 6757515555.

It is an arithmetic number, because the mean of its divisors is an integer number (6757515555).

Almost surely, 2^13515031109 is an apocalyptic number.

It is an amenable number.

13515031109 is a deficient number, since it is larger than the sum of its proper divisors (1).

13515031109 is an equidigital number, since it uses as much as digits as its factorization.

13515031109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2025, while the sum is 29.

The spelling of 13515031109 in words is "thirteen billion, five hundred fifteen million, thirty-one thousand, one hundred nine".