623073721 has 2 divisors, whose sum is σ = 623073722. Its totient is φ = 623073720.

The previous prime is 623073719. The next prime is 623073727. The reversal of 623073721 is 127370326.

623073721 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 can be written as a sum of positive squares in only one way, i.e., 394459321 + 228614400 = 19861^2 + 15120^2 .

It is a cyclic number.

It is not a de Polignac number, because 623073721 - 2¹ = 623073719 is a prime.

Together with 623073719, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (623073727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311536860 + 311536861.

It is an arithmetic number, because the mean of its divisors is an integer number (311536861).

Almost surely, 2^623073721 is an apocalyptic number.

It is an amenable number.

623073721 is a deficient number, since it is larger than the sum of its proper divisors (1).

623073721 is an equidigital number, since it uses as much as digits as its factorization.

623073721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 623073721 is about 24961.4446897610. Note that the first 3 decimals coincide. The cubic root of 623073721 is about 854.1086985284.

The spelling of 623073721 in words is "six hundred twenty-three million, seventy-three thousand, seven hundred twenty-one".