1312004539 has 4 divisors (see below), whose sum is σ = 1312199824. Its totient is φ = 1311809256.

The previous prime is 1312004521. The next prime is 1312004579. The reversal of 1312004539 is 9354002131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9354002131 = 59 ⋅158542409.

It is a cyclic number.

It is not a de Polignac number, because 1312004539 - 2⁷ = 1312004411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312004509) 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, 87192 + ... + 101125.

It is an arithmetic number, because the mean of its divisors is an integer number (328049956).

Almost surely, 2^1312004539 is an apocalyptic number.

1312004539 is a deficient number, since it is larger than the sum of its proper divisors (195285).

1312004539 is an equidigital number, since it uses as much as digits as its factorization.

1312004539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195284.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1312004539 is about 36221.6032085826. The cubic root of 1312004539 is about 1094.7419974146.

The spelling of 1312004539 in words is "one billion, three hundred twelve million, four thousand, five hundred thirty-nine".