11311389 has 6 divisors (see below), whose sum is σ = 16338686. Its totient is φ = 7540920.

The previous prime is 11311387. The next prime is 11311397. The reversal of 11311389 is 98311311.

It is a happy number.

11311389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11108889 + 202500 = 3333^2 + 450^2 .

It is not a de Polignac number, because 11311389 - 2¹ = 11311387 is a prime.

It is a super-2 number, since 2×11311389² = 255895042218642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311387) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 628402 + ... + 628419.

Almost surely, 2^11311389 is an apocalyptic number.

It is an amenable number.

11311389 is a deficient number, since it is larger than the sum of its proper divisors (5027297).

11311389 is a wasteful number, since it uses less digits than its factorization.

11311389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256827 (or 1256824 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 11311389 is about 3363.2408477538. The cubic root of 11311389 is about 224.4770670503.

It can be divided in two parts, 1 and 1311389, that added together give a triangular number (1311390 = T₁₆₁₉).

The spelling of 11311389 in words is "eleven million, three hundred eleven thousand, three hundred eighty-nine".