725891 has 2 divisors, whose sum is σ = 725892. Its totient is φ = 725890.

The previous prime is 725867. The next prime is 725897. The reversal of 725891 is 198527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 725891 - 2⁶ = 725827 is a prime.

It is a Chen prime.

It is equal to p₅₈₄₇₈ and since 725891 and 58478 have the same sum of digits, it is a Honaker prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 725891.

It is not a weakly prime, because it can be changed into another prime (725897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362945 + 362946.

It is an arithmetic number, because the mean of its divisors is an integer number (362946).

2⁷²⁵⁸⁹¹ is an apocalyptic number.

725891 is a deficient number, since it is larger than the sum of its proper divisors (1).

725891 is an equidigital number, since it uses as much as digits as its factorization.

725891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 725891 is about 851.9923708579. The cubic root of 725891 is about 89.8718753004.

The spelling of 725891 in words is "seven hundred twenty-five thousand, eight hundred ninety-one".