1312130987 has 4 divisors (see below), whose sum is σ = 1328740320. Its totient is φ = 1295521656.

The previous prime is 1312130983. The next prime is 1312130993. The reversal of 1312130987 is 7890312131.

It is a happy number.

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 1312130987 - 2² = 1312130983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312130983) 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, 8304548 + ... + 8304705.

It is an arithmetic number, because the mean of its divisors is an integer number (332185080).

Almost surely, 2^1312130987 is an apocalyptic number.

1312130987 is a deficient number, since it is larger than the sum of its proper divisors (16609333).

1312130987 is an equidigital number, since it uses as much as digits as its factorization.

1312130987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16609332.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1312130987 is about 36223.3486442101. The cubic root of 1312130987 is about 1094.7771658623. Note that the first 3 decimals are identical.

The spelling of 1312130987 in words is "one billion, three hundred twelve million, one hundred thirty thousand, nine hundred eighty-seven".