799949981 has 2 divisors, whose sum is σ = 799949982. Its totient is φ = 799949980.

The previous prime is 799949963. The next prime is 799949993. The reversal of 799949981 is 189949997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617969881 + 181980100 = 24859^2 + 13490^2 .

It is a cyclic number.

It is not a de Polignac number, because 799949981 - 2¹⁴ = 799933597 is a prime.

It is a super-2 number, since 2×799949981² = 1279839944203800722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (799949911) 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, 399974990 + 399974991.

It is an arithmetic number, because the mean of its divisors is an integer number (399974991).

Almost surely, 2^799949981 is an apocalyptic number.

It is an amenable number.

799949981 is a deficient number, since it is larger than the sum of its proper divisors (1).

799949981 is an equidigital number, since it uses as much as digits as its factorization.

799949981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 65.

The square root of 799949981 is about 28283.3870142881. The cubic root of 799949981 is about 928.2984190167.

The spelling of 799949981 in words is "seven hundred ninety-nine million, nine hundred forty-nine thousand, nine hundred eighty-one".