725591 has 4 divisors (see below), whose sum is σ = 763800. Its totient is φ = 687384.

The previous prime is 725587. The next prime is 725597. The reversal of 725591 is 195527.

725591 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 725591 - 2² = 725587 is a prime.

It is an Ulam number.

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 725591.

It is not an unprimeable number, because it can be changed into a prime (725597) 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, 19076 + ... + 19113.

It is an arithmetic number, because the mean of its divisors is an integer number (190950).

2⁷²⁵⁵⁹¹ is an apocalyptic number.

725591 is a deficient number, since it is larger than the sum of its proper divisors (38209).

725591 is a wasteful number, since it uses less digits than its factorization.

725591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38208.

The product of its digits is 3150, while the sum is 29.

The square root of 725591 is about 851.8162947490. The cubic root of 725591 is about 89.8594926894.

The spelling of 725591 in words is "seven hundred twenty-five thousand, five hundred ninety-one".