725105 has 4 divisors (see below), whose sum is σ = 870132. Its totient is φ = 580080.

The previous prime is 725099. The next prime is 725111. The reversal of 725105 is 501527.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (725099) and next prime (725111).

It can be written as a sum of positive squares in 2 ways, for example, as 173056 + 552049 = 416^2 + 743^2 .

It is not a de Polignac number, because 725105 - 2⁶ = 725041 is a prime.

It is a super-2 number, since 2×725105² = 1051554522050, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 725105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72506 + ... + 72515.

It is an arithmetic number, because the mean of its divisors is an integer number (217533).

2⁷²⁵¹⁰⁵ is an apocalyptic number.

It is an amenable number.

725105 is a deficient number, since it is larger than the sum of its proper divisors (145027).

725105 is a wasteful number, since it uses less digits than its factorization.

725105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145026.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 725105 is about 851.5309741871. The cubic root of 725105 is about 89.8394256142.

The spelling of 725105 in words is "seven hundred twenty-five thousand, one hundred five".