725651 has 4 divisors (see below), whose sum is σ = 728904. Its totient is φ = 722400.

The previous prime is 725639. The next prime is 725653. The reversal of 725651 is 156527.

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 725651 - 2⁶ = 725587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 725651.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 725651.

It is not an unprimeable number, because it can be changed into a prime (725653) 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, 1265 + ... + 1746.

It is an arithmetic number, because the mean of its divisors is an integer number (182226).

2⁷²⁵⁶⁵¹ is an apocalyptic number.

725651 is a deficient number, since it is larger than the sum of its proper divisors (3253).

725651 is a wasteful number, since it uses less digits than its factorization.

725651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252.

The product of its digits is 2100, while the sum is 26.

The square root of 725651 is about 851.8515128824. The cubic root of 725651 is about 89.8619694846.

The spelling of 725651 in words is "seven hundred twenty-five thousand, six hundred fifty-one".