13111990 has 16 divisors (see below), whose sum is σ = 24151248. Its totient is φ = 5122656.

The previous prime is 13111961. The next prime is 13112051. The reversal of 13111990 is 9911131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14817 + ... + 15676.

It is an arithmetic number, because the mean of its divisors is an integer number (1509453).

Almost surely, 2^13111990 is an apocalyptic number.

13111990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13111990 is a deficient number, since it is larger than the sum of its proper divisors (11039258).

13111990 is a wasteful number, since it uses less digits than its factorization.

13111990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30543.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 13111990 is about 3621.0481907868. The cubic root of 13111990 is about 235.8067339496.

It can be divided in two parts, 131 and 11990, that added together give a palindrome (12121).

The spelling of 13111990 in words is "thirteen million, one hundred eleven thousand, nine hundred ninety".