11517391 has 2 divisors, whose sum is σ = 11517392. Its totient is φ = 11517390.

The previous prime is 11517371. The next prime is 11517409. The reversal of 11517391 is 19371511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11517391 - 2²¹ = 9420239 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11517361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5758695 + 5758696.

It is an arithmetic number, because the mean of its divisors is an integer number (5758696).

Almost surely, 2^11517391 is an apocalyptic number.

11517391 is a deficient number, since it is larger than the sum of its proper divisors (1).

11517391 is an equidigital number, since it uses as much as digits as its factorization.

11517391 is an evil number, because the sum of its binary digits is even.

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

The square root of 11517391 is about 3393.7281859336. The cubic root of 11517391 is about 225.8315959011.

The spelling of 11517391 in words is "eleven million, five hundred seventeen thousand, three hundred ninety-one".