13311987 has 8 divisors (see below), whose sum is σ = 19114704. Its totient is φ = 8191968.

The previous prime is 13311973. The next prime is 13312001. The reversal of 13311987 is 78911331.

It is an interprime number because it is at equal distance from previous prime (13311973) and next prime (13312001).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13311987 - 2¹² = 13307891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13311937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170628 + ... + 170705.

It is an arithmetic number, because the mean of its divisors is an integer number (2389338).

Almost surely, 2^13311987 is an apocalyptic number.

13311987 is a deficient number, since it is larger than the sum of its proper divisors (5802717).

13311987 is a wasteful number, since it uses less digits than its factorization.

13311987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341349.

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

The square root of 13311987 is about 3648.5595787927. The cubic root of 13311987 is about 236.9996083242. Note that the first 3 decimals are identical.

The spelling of 13311987 in words is "thirteen million, three hundred eleven thousand, nine hundred eighty-seven".