1311539 has 4 divisors (see below), whose sum is σ = 1347024. Its totient is φ = 1276056.

The previous prime is 1311523. The next prime is 1311547. The reversal of 1311539 is 9351131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9351131 = 1427 ⋅6553.

It is not a de Polignac number, because 1311539 - 2⁴ = 1311523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311509) 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, 17687 + ... + 17760.

It is an arithmetic number, because the mean of its divisors is an integer number (336756).

2^1311539 is an apocalyptic number.

1311539 is a deficient number, since it is larger than the sum of its proper divisors (35485).

1311539 is an equidigital number, since it uses as much as digits as its factorization.

1311539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35484.

The product of its digits is 405, while the sum is 23.

The square root of 1311539 is about 1145.2244321529. The cubic root of 1311539 is about 109.4612499543.

The spelling of 1311539 in words is "one million, three hundred eleven thousand, five hundred thirty-nine".