1315999 has 4 divisors (see below), whose sum is σ = 1329664. Its totient is φ = 1302336.

The previous prime is 1315969. The next prime is 1316009. The reversal of 1315999 is 9995131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9995131 = 59 ⋅169409.

It is a cyclic number.

It is not a de Polignac number, because 1315999 - 2⁵ = 1315967 is a prime.

It is a Duffinian number.

1315999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315949) 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, 6687 + ... + 6880.

It is an arithmetic number, because the mean of its divisors is an integer number (332416).

2^1315999 is an apocalyptic number.

1315999 is a deficient number, since it is larger than the sum of its proper divisors (13665).

1315999 is an equidigital number, since it uses as much as digits as its factorization.

1315999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13664.

The product of its digits is 10935, while the sum is 37.

The square root of 1315999 is about 1147.1699961209. The cubic root of 1315999 is about 109.5851870065.

The spelling of 1315999 in words is "one million, three hundred fifteen thousand, nine hundred ninety-nine".