1318631087 has 4 divisors (see below), whose sum is σ = 1338312216. Its totient is φ = 1298949960.

The previous prime is 1318631063. The next prime is 1318631089. The reversal of 1318631087 is 7801368131.

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 1318631087 - 2⁶ = 1318631023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1318631087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318631089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9840464 + ... + 9840597.

It is an arithmetic number, because the mean of its divisors is an integer number (334578054).

Almost surely, 2^1318631087 is an apocalyptic number.

1318631087 is a deficient number, since it is larger than the sum of its proper divisors (19681129).

1318631087 is an equidigital number, since it uses as much as digits as its factorization.

1318631087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19681128.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 1318631087 is about 36312.9603172201. The cubic root of 1318631087 is about 1096.5819761446.

The spelling of 1318631087 in words is "one billion, three hundred eighteen million, six hundred thirty-one thousand, eighty-seven".