11891913 has 16 divisors (see below), whose sum is σ = 17496000. Its totient is φ = 7124480.

The previous prime is 11891833. The next prime is 11891917. The reversal of 11891913 is 31919811.

It is a happy number.

It is not a de Polignac number, because 11891913 - 2⁸ = 11891657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (11891917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 913 + ... + 4961.

It is an arithmetic number, because the mean of its divisors is an integer number (1093500).

Almost surely, 2^11891913 is an apocalyptic number.

It is an amenable number.

11891913 is a deficient number, since it is larger than the sum of its proper divisors (5604087).

11891913 is a wasteful number, since it uses less digits than its factorization.

11891913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4152.

The product of its digits is 1944, while the sum is 33.

The square root of 11891913 is about 3448.4653108303. The cubic root of 11891913 is about 228.2533924902.

The spelling of 11891913 in words is "eleven million, eight hundred ninety-one thousand, nine hundred thirteen".