13156989 has 16 divisors (see below), whose sum is σ = 18898944. Its totient is φ = 8118000.

The previous prime is 13156973. The next prime is 13156993. The reversal of 13156989 is 98965131.

13156989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13156989 - 2⁴ = 13156973 is a prime.

It is a super-2 number, since 2×13156989² = 346212719092242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13156989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13156909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 937 + ... + 5214.

It is an arithmetic number, because the mean of its divisors is an integer number (1181184).

Almost surely, 2^13156989 is an apocalyptic number.

It is an amenable number.

13156989 is a deficient number, since it is larger than the sum of its proper divisors (5741955).

13156989 is a wasteful number, since it uses less digits than its factorization.

13156989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6208.

The product of its digits is 58320, while the sum is 42.

The square root of 13156989 is about 3627.2564011936. The cubic root of 13156989 is about 236.0761807591.

The spelling of 13156989 in words is "thirteen million, one hundred fifty-six thousand, nine hundred eighty-nine".