721914811 has 2 divisors, whose sum is σ = 721914812. Its totient is φ = 721914810.

The previous prime is 721914803. The next prime is 721914821. The reversal of 721914811 is 118419127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721914811 - 2³ = 721914803 is a prime.

It is not a weakly prime, because it can be changed into another prime (721914821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360957405 + 360957406.

It is an arithmetic number, because the mean of its divisors is an integer number (360957406).

Almost surely, 2^721914811 is an apocalyptic number.

721914811 is a deficient number, since it is larger than the sum of its proper divisors (1).

721914811 is an equidigital number, since it uses as much as digits as its factorization.

721914811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 34.

The square root of 721914811 is about 26868.4724351795. The cubic root of 721914811 is about 897.0747870285.

The spelling of 721914811 in words is "seven hundred twenty-one million, nine hundred fourteen thousand, eight hundred eleven".