1509139 has 4 divisors (see below), whose sum is σ = 1511640. Its totient is φ = 1506640.

The previous prime is 1509133. The next prime is 1509143. The reversal of 1509139 is 9319051.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9319051 = 7 ⋅1331293.

It is a cyclic number.

It is not a de Polignac number, because 1509139 - 2⁹ = 1508627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1509133) 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, 279 + ... + 1759.

It is an arithmetic number, because the mean of its divisors is an integer number (377910).

2^1509139 is an apocalyptic number.

1509139 is a deficient number, since it is larger than the sum of its proper divisors (2501).

1509139 is a wasteful number, since it uses less digits than its factorization.

1509139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500.

The product of its (nonzero) digits is 1215, while the sum is 28.

The square root of 1509139 is about 1228.4701868584. The cubic root of 1509139 is about 114.7034324521.

The spelling of 1509139 in words is "one million, five hundred nine thousand, one hundred thirty-nine".