721852591 has 2 divisors, whose sum is σ = 721852592. Its totient is φ = 721852590.

The previous prime is 721852553. The next prime is 721852627. The reversal of 721852591 is 195258127.

721852591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (195258127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721852591 - 2¹⁹ = 721328303 is a prime.

It is equal to p_37324993 and since 721852591 and 37324993 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 (721852501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360926295 + 360926296.

It is an arithmetic number, because the mean of its divisors is an integer number (360926296).

Almost surely, 2^721852591 is an apocalyptic number.

721852591 is a deficient number, since it is larger than the sum of its proper divisors (1).

721852591 is an equidigital number, since it uses as much as digits as its factorization.

721852591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 40.

The square root of 721852591 is about 26867.3145476060. The cubic root of 721852591 is about 897.0490140905.

The spelling of 721852591 in words is "seven hundred twenty-one million, eight hundred fifty-two thousand, five hundred ninety-one".