716218981 has 2 divisors, whose sum is σ = 716218982. Its totient is φ = 716218980.

The previous prime is 716218969. The next prime is 716218999. The reversal of 716218981 is 189812617.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 535181956 + 181037025 = 23134^2 + 13455^2 .

It is a cyclic number.

It is not a de Polignac number, because 716218981 - 2⁹ = 716218469 is a prime.

It is a super-2 number, since 2×716218981² = 1025939257489356722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (716218901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358109490 + 358109491.

It is an arithmetic number, because the mean of its divisors is an integer number (358109491).

Almost surely, 2^716218981 is an apocalyptic number.

It is an amenable number.

716218981 is a deficient number, since it is larger than the sum of its proper divisors (1).

716218981 is an equidigital number, since it uses as much as digits as its factorization.

716218981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 43.

The square root of 716218981 is about 26762.2678598059. The cubic root of 716218981 is about 894.7092804403.

The spelling of 716218981 in words is "seven hundred sixteen million, two hundred eighteen thousand, nine hundred eighty-one".