725121 has 24 divisors (see below), whose sum is σ = 1138176. Its totient is φ = 443520.

The previous prime is 725119. The next prime is 725147. The reversal of 725121 is 121527.

It is not a de Polignac number, because 725121 - 2¹ = 725119 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 725094 and 725103.

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 725121.

It is not an unprimeable number, because it can be changed into a prime (725111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6361 + ... + 6473.

It is an arithmetic number, because the mean of its divisors is an integer number (47424).

2⁷²⁵¹²¹ is an apocalyptic number.

It is an amenable number.

725121 is a deficient number, since it is larger than the sum of its proper divisors (413055).

725121 is a wasteful number, since it uses less digits than its factorization.

725121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 170 counting only the distinct ones).

The product of its digits is 140, while the sum is 18.

The square root of 725121 is about 851.5403689785. The cubic root of 725121 is about 89.8400864013.

Adding to 725121 its reverse (121527), we get a palindrome (846648).

The spelling of 725121 in words is "seven hundred twenty-five thousand, one hundred twenty-one".