725381 has 2 divisors, whose sum is σ = 725382. Its totient is φ = 725380.

The previous prime is 725371. The next prime is 725393. The reversal of 725381 is 183527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 688900 + 36481 = 830^2 + 191^2 .

It is an emirp because it is prime and its reverse (183527) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 725381 - 2⁶ = 725317 is a prime.

It is a super-2 number, since 2×725381² = 1052355190322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 725381.

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 725381.

It is not a weakly prime, because it can be changed into another prime (725321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362690 + 362691.

It is an arithmetic number, because the mean of its divisors is an integer number (362691).

2⁷²⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

725381 is a deficient number, since it is larger than the sum of its proper divisors (1).

725381 is an equidigital number, since it uses as much as digits as its factorization.

725381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 725381 is about 851.6930198141. The cubic root of 725381 is about 89.8508228307.

The spelling of 725381 in words is "seven hundred twenty-five thousand, three hundred eighty-one".