2681215391 has 2 divisors, whose sum is σ = 2681215392. Its totient is φ = 2681215390.

The previous prime is 2681215379. The next prime is 2681215393. The reversal of 2681215391 is 1935121862.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2681215391 is a prime.

It is a Sophie Germain prime.

Together with 2681215393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2681215393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340607695 + 1340607696.

It is an arithmetic number, because the mean of its divisors is an integer number (1340607696).

Almost surely, 2^2681215391 is an apocalyptic number.

2681215391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2681215391 is an equidigital number, since it uses as much as digits as its factorization.

2681215391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 38.

The square root of 2681215391 is about 51780.4537542884. The cubic root of 2681215391 is about 1389.2398567948.

The spelling of 2681215391 in words is "two billion, six hundred eighty-one million, two hundred fifteen thousand, three hundred ninety-one".