1315912987 has 4 divisors (see below), whose sum is σ = 1316567416. Its totient is φ = 1315258560.

The previous prime is 1315912979. The next prime is 1315912993. The reversal of 1315912987 is 7892195131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7892195131 = 107 ⋅73758833.

It is a cyclic number.

It is not a de Polignac number, because 1315912987 - 2³ = 1315912979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315912937) 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, 324189 + ... + 328222.

It is an arithmetic number, because the mean of its divisors is an integer number (329141854).

Almost surely, 2^1315912987 is an apocalyptic number.

1315912987 is a deficient number, since it is larger than the sum of its proper divisors (654429).

1315912987 is an equidigital number, since it uses as much as digits as its factorization.

1315912987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654428.

The product of its digits is 136080, while the sum is 46.

The square root of 1315912987 is about 36275.5149791150. The cubic root of 1315912987 is about 1095.8279947783.

The spelling of 1315912987 in words is "one billion, three hundred fifteen million, nine hundred twelve thousand, nine hundred eighty-seven".