13155401809 has 9 divisors (see below), whose sum is σ = 14461456681. Its totient is φ = 11958309220.

The previous prime is 13155401797. The next prime is 13155401813. The reversal of 13155401809 is 90810455131.

The square root of 13155401809 is 114697.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 13155401809 - 2¹³ = 13155393617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13155401869) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1256454 + ... + 1266880.

Almost surely, 2^13155401809 is an apocalyptic number.

13155401809 is the 114697-th square number.

13155401809 is the 57349-th centered octagonal number.

It is an amenable number.

13155401809 is a deficient number, since it is larger than the sum of its proper divisors (1306054872).

13155401809 is an frugal number, since it uses more digits than its factorization.

13155401809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20876 (or 10438 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 37.

The spelling of 13155401809 in words is "thirteen billion, one hundred fifty-five million, four hundred one thousand, eight hundred nine".