1299645983 has 4 divisors (see below), whose sum is σ = 1317950928. Its totient is φ = 1281341040.

The previous prime is 1299645901. The next prime is 1299646001. The reversal of 1299645983 is 3895469921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1299645983 - 2¹⁴ = 1299629599 is a prime.

It is a super-2 number, since 2×1299645983² = 3378159362256072578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299645283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9152366 + ... + 9152507.

It is an arithmetic number, because the mean of its divisors is an integer number (329487732).

Almost surely, 2^1299645983 is an apocalyptic number.

1299645983 is a deficient number, since it is larger than the sum of its proper divisors (18304945).

1299645983 is an equidigital number, since it uses as much as digits as its factorization.

1299645983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18304944.

The product of its digits is 4199040, while the sum is 56.

The square root of 1299645983 is about 36050.6030878819. The cubic root of 1299645983 is about 1091.2938044170.

The spelling of 1299645983 in words is "one billion, two hundred ninety-nine million, six hundred forty-five thousand, nine hundred eighty-three".