11987291 has 2 divisors, whose sum is σ = 11987292. Its totient is φ = 11987290.

The previous prime is 11987279. The next prime is 11987299. The reversal of 11987291 is 19278911.

It is a strong prime.

It is an emirp because it is prime and its reverse (19278911) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11987291 is a prime.

It is not a weakly prime, because it can be changed into another prime (11987299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5993645 + 5993646.

It is an arithmetic number, because the mean of its divisors is an integer number (5993646).

Almost surely, 2^11987291 is an apocalyptic number.

11987291 is a deficient number, since it is larger than the sum of its proper divisors (1).

11987291 is an equidigital number, since it uses as much as digits as its factorization.

11987291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 38.

The square root of 11987291 is about 3462.2667430457. The cubic root of 11987291 is about 228.8619967760.

The spelling of 11987291 in words is "eleven million, nine hundred eighty-seven thousand, two hundred ninety-one".