11715391 has 4 divisors (see below), whose sum is σ = 12119400. Its totient is φ = 11311384.

The previous prime is 11715383. The next prime is 11715401. The reversal of 11715391 is 19351711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11715391 - 2³ = 11715383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11715331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201961 + ... + 202018.

It is an arithmetic number, because the mean of its divisors is an integer number (3029850).

Almost surely, 2^11715391 is an apocalyptic number.

11715391 is a deficient number, since it is larger than the sum of its proper divisors (404009).

11715391 is an equidigital number, since it uses as much as digits as its factorization.

11715391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404008.

The product of its digits is 945, while the sum is 28.

The square root of 11715391 is about 3422.7753358934. The cubic root of 11715391 is about 227.1183699570.

The spelling of 11715391 in words is "eleven million, seven hundred fifteen thousand, three hundred ninety-one".