1313798987 has 4 divisors (see below), whose sum is σ = 1314119040. Its totient is φ = 1313478936.

The previous prime is 1313798971. The next prime is 1313798999. The reversal of 1313798987 is 7898973131.

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 1313798987 - 2⁴ = 1313798971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313798287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153788 + ... + 162105.

It is an arithmetic number, because the mean of its divisors is an integer number (328529760).

Almost surely, 2^1313798987 is an apocalyptic number.

1313798987 is a deficient number, since it is larger than the sum of its proper divisors (320053).

1313798987 is an equidigital number, since it uses as much as digits as its factorization.

1313798987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320052.

The product of its digits is 2286144, while the sum is 56.

The square root of 1313798987 is about 36246.3651556953. The cubic root of 1313798987 is about 1095.2408683162.

The spelling of 1313798987 in words is "one billion, three hundred thirteen million, seven hundred ninety-eight thousand, nine hundred eighty-seven".