1291920683 has 2 divisors, whose sum is σ = 1291920684. Its totient is φ = 1291920682.

The previous prime is 1291920677. The next prime is 1291920709. The reversal of 1291920683 is 3860291921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1291920683 - 2¹⁰ = 1291919659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1291920683.

It is not a weakly prime, because it can be changed into another prime (1291920613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645960341 + 645960342.

It is an arithmetic number, because the mean of its divisors is an integer number (645960342).

Almost surely, 2^1291920683 is an apocalyptic number.

1291920683 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291920683 is an equidigital number, since it uses as much as digits as its factorization.

1291920683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 1291920683 is about 35943.2981653048. The cubic root of 1291920683 is about 1089.1272319465.

The spelling of 1291920683 in words is "one billion, two hundred ninety-one million, nine hundred twenty thousand, six hundred eighty-three".