11512451491 has 2 divisors, whose sum is σ = 11512451492. Its totient is φ = 11512451490.

The previous prime is 11512451473. The next prime is 11512451497. The reversal of 11512451491 is 19415421511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11512451491 - 2⁹ = 11512450979 is a prime.

It is not a weakly prime, because it can be changed into another prime (11512451497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5756225745 + 5756225746.

It is an arithmetic number, because the mean of its divisors is an integer number (5756225746).

Almost surely, 2^11512451491 is an apocalyptic number.

11512451491 is a deficient number, since it is larger than the sum of its proper divisors (1).

11512451491 is an equidigital number, since it uses as much as digits as its factorization.

11512451491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 34.

The spelling of 11512451491 in words is "eleven billion, five hundred twelve million, four hundred fifty-one thousand, four hundred ninety-one".