12811511 has 2 divisors, whose sum is σ = 12811512. Its totient is φ = 12811510.

The previous prime is 12811499. The next prime is 12811541. The reversal of 12811511 is 11511821.

It is a weak prime.

It is an emirp because it is prime and its reverse (11511821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12811511 - 2²² = 8617207 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12811541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6405755 + 6405756.

It is an arithmetic number, because the mean of its divisors is an integer number (6405756).

Almost surely, 2^12811511 is an apocalyptic number.

12811511 is a deficient number, since it is larger than the sum of its proper divisors (1).

12811511 is an equidigital number, since it uses as much as digits as its factorization.

12811511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80, while the sum is 20.

The square root of 12811511 is about 3579.3171136405. The cubic root of 12811511 is about 233.9915196479.

The spelling of 12811511 in words is "twelve million, eight hundred eleven thousand, five hundred eleven".