725562391 has 2 divisors, whose sum is σ = 725562392. Its totient is φ = 725562390.

The previous prime is 725562379. The next prime is 725562427. The reversal of 725562391 is 193265527.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 725562391 - 2¹⁷ = 725431319 is a prime.

It is equal to p_37506964 and since 725562391 and 37506964 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725562311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362781195 + 362781196.

It is an arithmetic number, because the mean of its divisors is an integer number (362781196).

Almost surely, 2^725562391 is an apocalyptic number.

725562391 is a deficient number, since it is larger than the sum of its proper divisors (1).

725562391 is an equidigital number, since it uses as much as digits as its factorization.

725562391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 40.

The square root of 725562391 is about 26936.2653498959. The cubic root of 725562391 is about 898.5831166406.

It can be divided in two parts, 72556 and 2391, that added together give a palindrome (74947).

The spelling of 725562391 in words is "seven hundred twenty-five million, five hundred sixty-two thousand, three hundred ninety-one".