11715891 has 8 divisors (see below), whose sum is σ = 17041344. Its totient is φ = 7100520.

The previous prime is 11715889. The next prime is 11715911. The reversal of 11715891 is 19851711.

11715891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11715891 - 2¹ = 11715889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 355027 = 11715891 / (1 + 1 + 7 + 1 + 5 + 8 + 9 + 1).

It is not an unprimeable number, because it can be changed into a prime (11715881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177481 + ... + 177546.

It is an arithmetic number, because the mean of its divisors is an integer number (2130168).

Almost surely, 2^11715891 is an apocalyptic number.

11715891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11715891 is a deficient number, since it is larger than the sum of its proper divisors (5325453).

11715891 is a wasteful number, since it uses less digits than its factorization.

11715891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355041.

The product of its digits is 2520, while the sum is 33.

The square root of 11715891 is about 3422.8483752571. The cubic root of 11715891 is about 227.1216009651.

The spelling of 11715891 in words is "eleven million, seven hundred fifteen thousand, eight hundred ninety-one".