11972491 has 2 divisors, whose sum is σ = 11972492. Its totient is φ = 11972490.

The previous prime is 11972473. The next prime is 11972537. The reversal of 11972491 is 19427911.

It is a weak prime.

It is an emirp because it is prime and its reverse (19427911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11972491 - 2⁵ = 11972459 is a prime.

It is not a weakly prime, because it can be changed into another prime (11972461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5986245 + 5986246.

It is an arithmetic number, because the mean of its divisors is an integer number (5986246).

Almost surely, 2^11972491 is an apocalyptic number.

11972491 is a deficient number, since it is larger than the sum of its proper divisors (1).

11972491 is an equidigital number, since it uses as much as digits as its factorization.

11972491 is an odious number, because the sum of its binary digits is odd.

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

The square root of 11972491 is about 3460.1287548298. The cubic root of 11972491 is about 228.7677705247.

The spelling of 11972491 in words is "eleven million, nine hundred seventy-two thousand, four hundred ninety-one".