814000721 has 2 divisors, whose sum is σ = 814000722. Its totient is φ = 814000720.

The previous prime is 814000709. The next prime is 814000741. The reversal of 814000721 is 127000418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 812877121 + 1123600 = 28511^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 814000721 - 2¹⁴ = 813984337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (814000741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407000360 + 407000361.

It is an arithmetic number, because the mean of its divisors is an integer number (407000361).

Almost surely, 2^814000721 is an apocalyptic number.

It is an amenable number.

814000721 is a deficient number, since it is larger than the sum of its proper divisors (1).

814000721 is an equidigital number, since it uses as much as digits as its factorization.

814000721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 814000721 is about 28530.6978708899. The cubic root of 814000721 is about 933.7019443533.

The spelling of 814000721 in words is "eight hundred fourteen million, seven hundred twenty-one", and thus it is an aban number.