721450783 has 2 divisors, whose sum is σ = 721450784. Its totient is φ = 721450782.

The previous prime is 721450747. The next prime is 721450837. The reversal of 721450783 is 387054127.

721450783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (721450837) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721450783 - 2⁹ = 721450271 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721450703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360725391 + 360725392.

It is an arithmetic number, because the mean of its divisors is an integer number (360725392).

Almost surely, 2^721450783 is an apocalyptic number.

721450783 is a deficient number, since it is larger than the sum of its proper divisors (1).

721450783 is an equidigital number, since it uses as much as digits as its factorization.

721450783 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 721450783 is about 26859.8358706825. The cubic root of 721450783 is about 896.8825404118.

The spelling of 721450783 in words is "seven hundred twenty-one million, four hundred fifty thousand, seven hundred eighty-three".