11991413 has 16 divisors (see below), whose sum is σ = 14928000. Its totient is φ = 9398592.

The previous prime is 11991407. The next prime is 11991433. The reversal of 11991413 is 31419911.

It is not a de Polignac number, because 11991413 - 2²² = 7797109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11991433) 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, 2303 + ... + 5411.

It is an arithmetic number, because the mean of its divisors is an integer number (933000).

Almost surely, 2^11991413 is an apocalyptic number.

It is an amenable number.

11991413 is a deficient number, since it is larger than the sum of its proper divisors (2936587).

11991413 is a wasteful number, since it uses less digits than its factorization.

11991413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3164.

The product of its digits is 972, while the sum is 29.

The square root of 11991413 is about 3462.8619666397. The cubic root of 11991413 is about 228.8882262508. Note that the first 3 decimals are identical.

The spelling of 11991413 in words is "eleven million, nine hundred ninety-one thousand, four hundred thirteen".