725531 has 2 divisors, whose sum is σ = 725532. Its totient is φ = 725530.

The previous prime is 725519. The next prime is 725537. The reversal of 725531 is 135527.

725531 is nontrivially palindromic in base 16.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 725531 - 2¹⁸ = 463387 is a prime.

It is a super-2 number, since 2×725531² = 1052790463922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 725497 and 725506.

It is not a weakly prime, because it can be changed into another prime (725537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362765 + 362766.

It is an arithmetic number, because the mean of its divisors is an integer number (362766).

2⁷²⁵⁵³¹ is an apocalyptic number.

725531 is a deficient number, since it is larger than the sum of its proper divisors (1).

725531 is an equidigital number, since it uses as much as digits as its factorization.

725531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1050, while the sum is 23.

The square root of 725531 is about 851.7810751596. The cubic root of 725531 is about 89.8570157576.

The spelling of 725531 in words is "seven hundred twenty-five thousand, five hundred thirty-one".