721875799 has 2 divisors, whose sum is σ = 721875800. Its totient is φ = 721875798.

The previous prime is 721875727. The next prime is 721875841. The reversal of 721875799 is 997578127.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721875799 is a prime.

It is a super-2 number, since 2×721875799² = 1042209338363776802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721875599) 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, 360937899 + 360937900.

It is an arithmetic number, because the mean of its divisors is an integer number (360937900).

Almost surely, 2^721875799 is an apocalyptic number.

721875799 is a deficient number, since it is larger than the sum of its proper divisors (1).

721875799 is an equidigital number, since it uses as much as digits as its factorization.

721875799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2222640, while the sum is 55.

The square root of 721875799 is about 26867.7464443894. The cubic root of 721875799 is about 897.0586275447.

The spelling of 721875799 in words is "seven hundred twenty-one million, eight hundred seventy-five thousand, seven hundred ninety-nine".