725551 has 8 divisors (see below), whose sum is σ = 760320. Its totient is φ = 691488.

The previous prime is 725537. The next prime is 725579. The reversal of 725551 is 155527.

It is a happy number.

725551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(725551) divides (725551-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 725551 - 2⁵ = 725519 is a prime.

It is a Duffinian number.

725551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3585 + ... + 3781.

It is an arithmetic number, because the mean of its divisors is an integer number (95040).

2⁷²⁵⁵⁵¹ is an apocalyptic number.

725551 is a deficient number, since it is larger than the sum of its proper divisors (34769).

725551 is a wasteful number, since it uses less digits than its factorization.

725551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353.

The product of its digits is 1750, while the sum is 25.

The square root of 725551 is about 851.7928151845. The cubic root of 725551 is about 89.8578414167.

The spelling of 725551 in words is "seven hundred twenty-five thousand, five hundred fifty-one".