725491 has 4 divisors (see below), whose sum is σ = 781312. Its totient is φ = 669672.

The previous prime is 725479. The next prime is 725507. The reversal of 725491 is 194527.

It is a happy number.

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 725491 - 2¹⁹ = 201203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27891 + ... + 27916.

It is an arithmetic number, because the mean of its divisors is an integer number (195328).

2⁷²⁵⁴⁹¹ is an apocalyptic number.

725491 is a deficient number, since it is larger than the sum of its proper divisors (55821).

725491 is a wasteful number, since it uses less digits than its factorization.

725491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55820.

The product of its digits is 2520, while the sum is 28.

The square root of 725491 is about 851.7575946242. The cubic root of 725491 is about 89.8553643939.

The spelling of 725491 in words is "seven hundred twenty-five thousand, four hundred ninety-one".