13113987 has 16 divisors (see below), whose sum is σ = 18911232. Its totient is φ = 8051840.

The previous prime is 13113983. The next prime is 13114033. The reversal of 13113987 is 78931131.

It is a cyclic number.

It is not a de Polignac number, because 13113987 - 2² = 13113983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13113983) 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, 339 + ... + 5132.

It is an arithmetic number, because the mean of its divisors is an integer number (1181952).

Almost surely, 2^13113987 is an apocalyptic number.

13113987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

13113987 is a deficient number, since it is larger than the sum of its proper divisors (5797245).

13113987 is a wasteful number, since it uses less digits than its factorization.

13113987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5538.

The product of its digits is 4536, while the sum is 33.

The square root of 13113987 is about 3621.3239291729. The cubic root of 13113987 is about 235.8187047270.

The spelling of 13113987 in words is "thirteen million, one hundred thirteen thousand, nine hundred eighty-seven".