11511491 has 2 divisors, whose sum is σ = 11511492. Its totient is φ = 11511490.

The previous prime is 11511481. The next prime is 11511517. The reversal of 11511491 is 19411511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11511491 - 2⁶ = 11511427 is a prime.

It is not a weakly prime, because it can be changed into another prime (11511421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5755745 + 5755746.

It is an arithmetic number, because the mean of its divisors is an integer number (5755746).

Almost surely, 2^11511491 is an apocalyptic number.

11511491 is a deficient number, since it is larger than the sum of its proper divisors (1).

11511491 is an equidigital number, since it uses as much as digits as its factorization.

11511491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 23.

The square root of 11511491 is about 3392.8588240597. The cubic root of 11511491 is about 225.7930271547.

The spelling of 11511491 in words is "eleven million, five hundred eleven thousand, four hundred ninety-one".