1311890002 has 4 divisors (see below), whose sum is σ = 1967835006. Its totient is φ = 655945000.

The previous prime is 1311889981. The next prime is 1311890003. The reversal of 1311890002 is 2000981131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2000981131 = 191 ⋅10476341.

It can be written as a sum of positive squares in only one way, i.e., 862068321 + 449821681 = 29361^2 + 21209^2 .

It is not an unprimeable number, because it can be changed into a prime (1311890003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327972499 + ... + 327972502.

Almost surely, 2^1311890002 is an apocalyptic number.

1311890002 is a deficient number, since it is larger than the sum of its proper divisors (655945004).

1311890002 is an equidigital number, since it uses as much as digits as its factorization.

1311890002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655945003.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1311890002 is about 36220.0221148469. The cubic root of 1311890002 is about 1094.7101397725.

The spelling of 1311890002 in words is "one billion, three hundred eleven million, eight hundred ninety thousand, two".