11391251 has 2 divisors, whose sum is σ = 11391252. Its totient is φ = 11391250.

The previous prime is 11391239. The next prime is 11391253. The reversal of 11391251 is 15219311.

11391251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11391251 is a prime.

It is a Sophie Germain prime.

Together with 11391253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11391253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5695625 + 5695626.

It is an arithmetic number, because the mean of its divisors is an integer number (5695626).

Almost surely, 2^11391251 is an apocalyptic number.

11391251 is a deficient number, since it is larger than the sum of its proper divisors (1).

11391251 is an equidigital number, since it uses as much as digits as its factorization.

11391251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 23.

The square root of 11391251 is about 3375.0927394666. The cubic root of 11391251 is about 225.0041217352.

The spelling of 11391251 in words is "eleven million, three hundred ninety-one thousand, two hundred fifty-one".