11431989 has 32 divisors (see below), whose sum is σ = 18144000. Its totient is φ = 7096320.

The previous prime is 11431957. The next prime is 11431993. The reversal of 11431989 is 98913411.

11431989 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11431989 - 2⁵ = 11431957 is a prime.

It is a super-2 number, since 2×11431989² = 261380744992242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11431919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25237 + ... + 25685.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^11431989 is an apocalyptic number.

It is an amenable number.

11431989 is a deficient number, since it is larger than the sum of its proper divisors (6712011).

11431989 is a wasteful number, since it uses less digits than its factorization.

11431989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 516 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 11431989 is about 3381.1224467623. The cubic root of 11431989 is about 225.2720265411.

The spelling of 11431989 in words is "eleven million, four hundred thirty-one thousand, nine hundred eighty-nine".