721028899 has 2 divisors, whose sum is σ = 721028900. Its totient is φ = 721028898.

The previous prime is 721028897. The next prime is 721028923. The reversal of 721028899 is 998820127.

721028899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721028899 - 2¹ = 721028897 is a prime.

Together with 721028897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (721028897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360514449 + 360514450.

It is an arithmetic number, because the mean of its divisors is an integer number (360514450).

Almost surely, 2^721028899 is an apocalyptic number.

721028899 is a deficient number, since it is larger than the sum of its proper divisors (1).

721028899 is an equidigital number, since it uses as much as digits as its factorization.

721028899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 721028899 is about 26851.9812863036. The cubic root of 721028899 is about 896.7076824811.

The spelling of 721028899 in words is "seven hundred twenty-one million, twenty-eight thousand, eight hundred ninety-nine".