615139 has 4 divisors (see below), whose sum is σ = 703024. Its totient is φ = 527256.

The previous prime is 615137. The next prime is 615151. The reversal of 615139 is 931516.

615139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 615139 - 2¹ = 615137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (615137) 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, 43932 + ... + 43945.

It is an arithmetic number, because the mean of its divisors is an integer number (175756).

2⁶¹⁵¹³⁹ is an apocalyptic number.

615139 is a deficient number, since it is larger than the sum of its proper divisors (87885).

615139 is an equidigital number, since it uses as much as digits as its factorization.

615139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87884.

The product of its digits is 810, while the sum is 25.

The square root of 615139 is about 784.3079752240. The cubic root of 615139 is about 85.0467562828.

The spelling of 615139 in words is "six hundred fifteen thousand, one hundred thirty-nine".