615591 has 6 divisors (see below), whose sum is σ = 889200. Its totient is φ = 410388.

The previous prime is 615577. The next prime is 615599. The reversal of 615591 is 195516.

615591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 615591 - 2¹⁹ = 91303 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 615591.

It is not an unprimeable number, because it can be changed into a prime (615599) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34191 + ... + 34208.

It is an arithmetic number, because the mean of its divisors is an integer number (148200).

2⁶¹⁵⁵⁹¹ is an apocalyptic number.

615591 is a deficient number, since it is larger than the sum of its proper divisors (273609).

615591 is a wasteful number, since it uses less digits than its factorization.

615591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68405 (or 68402 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 615591 is about 784.5960744230. The cubic root of 615591 is about 85.0675817777.

The spelling of 615591 in words is "six hundred fifteen thousand, five hundred ninety-one".