13551912509 has 2 divisors, whose sum is σ = 13551912510. Its totient is φ = 13551912508.

The previous prime is 13551912481. The next prime is 13551912523. The reversal of 13551912509 is 90521915531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13536624409 + 15288100 = 116347^2 + 3910^2 .

It is an emirp because it is prime and its reverse (90521915531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13551912509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13551932509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6775956254 + 6775956255.

It is an arithmetic number, because the mean of its divisors is an integer number (6775956255).

Almost surely, 2^13551912509 is an apocalyptic number.

It is an amenable number.

13551912509 is a deficient number, since it is larger than the sum of its proper divisors (1).

13551912509 is an equidigital number, since it uses as much as digits as its factorization.

13551912509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60750, while the sum is 41.

The spelling of 13551912509 in words is "thirteen billion, five hundred fifty-one million, nine hundred twelve thousand, five hundred nine".