721377023 has 2 divisors, whose sum is σ = 721377024. Its totient is φ = 721377022.

The previous prime is 721376993. The next prime is 721377071. The reversal of 721377023 is 320773127.

It is a weak prime.

It is an emirp because it is prime and its reverse (320773127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721377023 - 2¹⁸ = 721114879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721377323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360688511 + 360688512.

It is an arithmetic number, because the mean of its divisors is an integer number (360688512).

Almost surely, 2^721377023 is an apocalyptic number.

721377023 is a deficient number, since it is larger than the sum of its proper divisors (1).

721377023 is an equidigital number, since it uses as much as digits as its factorization.

721377023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12348, while the sum is 32.

The square root of 721377023 is about 26858.4627817751. The cubic root of 721377023 is about 896.8519740806.

The spelling of 721377023 in words is "seven hundred twenty-one million, three hundred seventy-seven thousand, twenty-three".