720219881 has 2 divisors, whose sum is σ = 720219882. Its totient is φ = 720219880.

The previous prime is 720219847. The next prime is 720219883. The reversal of 720219881 is 188912027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434305600 + 285914281 = 20840^2 + 16909^2 .

It is an emirp because it is prime and its reverse (188912027) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720219881 is a prime.

It is a super-2 number, since 2×720219881² = 1037433353975308322, which contains 22 as substring.

Together with 720219883, 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 (720219883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360109940 + 360109941.

It is an arithmetic number, because the mean of its divisors is an integer number (360109941).

Almost surely, 2^720219881 is an apocalyptic number.

It is an amenable number.

720219881 is a deficient number, since it is larger than the sum of its proper divisors (1).

720219881 is an equidigital number, since it uses as much as digits as its factorization.

720219881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 720219881 is about 26836.9126577555. The cubic root of 720219881 is about 896.3721785213.

The spelling of 720219881 in words is "seven hundred twenty million, two hundred nineteen thousand, eight hundred eighty-one".