11520391 has 2 divisors, whose sum is σ = 11520392. Its totient is φ = 11520390.

The previous prime is 11520371. The next prime is 11520409. The reversal of 11520391 is 19302511.

11520391 is nontrivially palindromic in base 14.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11520391 - 2¹³ = 11512199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11520331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5760195 + 5760196.

It is an arithmetic number, because the mean of its divisors is an integer number (5760196).

Almost surely, 2^11520391 is an apocalyptic number.

11520391 is a deficient number, since it is larger than the sum of its proper divisors (1).

11520391 is an equidigital number, since it uses as much as digits as its factorization.

11520391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 11520391 is about 3394.1701489466. The cubic root of 11520391 is about 225.8512020768.

It can be divided in two parts, 11520 and 391, that added together give a palindrome (11911).

The spelling of 11520391 in words is "eleven million, five hundred twenty thousand, three hundred ninety-one".