11247991 has 2 divisors, whose sum is σ = 11247992. Its totient is φ = 11247990.

The previous prime is 11247979. The next prime is 11247997. The reversal of 11247991 is 19974211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11247991 - 2¹⁹ = 10723703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11247997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5623995 + 5623996.

It is an arithmetic number, because the mean of its divisors is an integer number (5623996).

Almost surely, 2^11247991 is an apocalyptic number.

11247991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11247991 is an equidigital number, since it uses as much as digits as its factorization.

11247991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 34.

The square root of 11247991 is about 3353.8024688404. The cubic root of 11247991 is about 224.0568985455.

The spelling of 11247991 in words is "eleven million, two hundred forty-seven thousand, nine hundred ninety-one".