1336681391 has 2 divisors, whose sum is σ = 1336681392. Its totient is φ = 1336681390.

The previous prime is 1336681387. The next prime is 1336681393. The reversal of 1336681391 is 1931866331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1336681391 - 2² = 1336681387 is a prime.

Together with 1336681393, 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 (1336681393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 668340695 + 668340696.

It is an arithmetic number, because the mean of its divisors is an integer number (668340696).

Almost surely, 2^1336681391 is an apocalyptic number.

1336681391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1336681391 is an equidigital number, since it uses as much as digits as its factorization.

1336681391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 1336681391 is about 36560.6535909849. The cubic root of 1336681391 is about 1101.5628998396.

The spelling of 1336681391 in words is "one billion, three hundred thirty-six million, six hundred eighty-one thousand, three hundred ninety-one".