725517 has 30 divisors (see below), whose sum is σ = 1195722. Its totient is φ = 438048.

The previous prime is 725507. The next prime is 725519. The reversal of 725517 is 715527.

It can be written as a sum of positive squares in 3 ways, for example, as 9801 + 715716 = 99^2 + 846^2 .

It is a de Polignac number, because none of the positive numbers 2^k-725517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 725517.

It is not an unprimeable number, because it can be changed into a prime (725519) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 13663 + ... + 13715.

2⁷²⁵⁵¹⁷ is an apocalyptic number.

It is an amenable number.

725517 is a deficient number, since it is larger than the sum of its proper divisors (470205).

725517 is a wasteful number, since it uses less digits than its factorization.

725517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 69 counting only the distinct ones).

The product of its digits is 2450, while the sum is 27.

The square root of 725517 is about 851.7728570458. The cubic root of 725517 is about 89.8564377872.

The spelling of 725517 in words is "seven hundred twenty-five thousand, five hundred seventeen".