11891291 has 2 divisors, whose sum is σ = 11891292. Its totient is φ = 11891290.

The previous prime is 11891287. The next prime is 11891303. The reversal of 11891291 is 19219811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11891291 - 2² = 11891287 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11891251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5945645 + 5945646.

It is an arithmetic number, because the mean of its divisors is an integer number (5945646).

Almost surely, 2^11891291 is an apocalyptic number.

11891291 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891291 is an equidigital number, since it uses as much as digits as its factorization.

11891291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 32.

The square root of 11891291 is about 3448.3751246058. The cubic root of 11891291 is about 228.2494128645.

The spelling of 11891291 in words is "eleven million, eight hundred ninety-one thousand, two hundred ninety-one".