720275891 has 2 divisors, whose sum is σ = 720275892. Its totient is φ = 720275890.

The previous prime is 720275867. The next prime is 720275903. The reversal of 720275891 is 198572027.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720275891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (720275851) 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, 360137945 + 360137946.

It is an arithmetic number, because the mean of its divisors is an integer number (360137946).

Almost surely, 2^720275891 is an apocalyptic number.

720275891 is a deficient number, since it is larger than the sum of its proper divisors (1).

720275891 is an equidigital number, since it uses as much as digits as its factorization.

720275891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 720275891 is about 26837.9561628675. The cubic root of 720275891 is about 896.3954142514.

The spelling of 720275891 in words is "seven hundred twenty million, two hundred seventy-five thousand, eight hundred ninety-one".