1309999903 has 2 divisors, whose sum is σ = 1309999904. Its totient is φ = 1309999902.

The previous prime is 1309999877. The next prime is 1309999909. The reversal of 1309999903 is 3099999031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1309999903 - 2⁵ = 1309999871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1309999909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654999951 + 654999952.

It is an arithmetic number, because the mean of its divisors is an integer number (654999952).

Almost surely, 2^1309999903 is an apocalyptic number.

1309999903 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309999903 is an equidigital number, since it uses as much as digits as its factorization.

1309999903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 531441, while the sum is 52.

The square root of 1309999903 is about 36193.9208017037. The cubic root of 1309999903 is about 1094.1841543569.

The spelling of 1309999903 in words is "one billion, three hundred nine million, nine hundred ninety-nine thousand, nine hundred three".