725155 has 4 divisors (see below), whose sum is σ = 870192. Its totient is φ = 580120.

The previous prime is 725149. The next prime is 725159. The reversal of 725155 is 551527.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551527 = 467 ⋅1181.

It is not a de Polignac number, because 725155 - 2³ = 725147 is a prime.

It is a Duffinian number.

725155 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (725159) 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, 72511 + ... + 72520.

It is an arithmetic number, because the mean of its divisors is an integer number (217548).

2⁷²⁵¹⁵⁵ is an apocalyptic number.

725155 is a deficient number, since it is larger than the sum of its proper divisors (145037).

725155 is a wasteful number, since it uses less digits than its factorization.

725155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145036.

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

The square root of 725155 is about 851.5603325660. The cubic root of 725155 is about 89.8414905418.

The spelling of 725155 in words is "seven hundred twenty-five thousand, one hundred fifty-five".