1299690943 has 2 divisors, whose sum is σ = 1299690944. Its totient is φ = 1299690942.

The previous prime is 1299690937. The next prime is 1299690979. The reversal of 1299690943 is 3490969921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1299690943 - 2⁵ = 1299690911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299690913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649845471 + 649845472.

It is an arithmetic number, because the mean of its divisors is an integer number (649845472).

Almost surely, 2^1299690943 is an apocalyptic number.

1299690943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299690943 is an equidigital number, since it uses as much as digits as its factorization.

1299690943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 944784, while the sum is 52.

The square root of 1299690943 is about 36051.2266504206. The cubic root of 1299690943 is about 1091.3063883577.

The spelling of 1299690943 in words is "one billion, two hundred ninety-nine million, six hundred ninety thousand, nine hundred forty-three".