83299981 has 2 divisors, whose sum is σ = 83299982. Its totient is φ = 83299980.

The previous prime is 83299943. The next prime is 83300029. The reversal of 83299981 is 18999238.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52330756 + 30969225 = 7234^2 + 5565^2 .

It is a cyclic number.

It is not a de Polignac number, because 83299981 - 2¹⁵ = 83267213 is a prime.

It is a super-2 number, since 2×83299981² = 13877773669200722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83299081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41649990 + 41649991.

It is an arithmetic number, because the mean of its divisors is an integer number (41649991).

Almost surely, 2^83299981 is an apocalyptic number.

It is an amenable number.

83299981 is a deficient number, since it is larger than the sum of its proper divisors (1).

83299981 is an equidigital number, since it uses as much as digits as its factorization.

83299981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 49.

The square root of 83299981 is about 9126.8823264026. The cubic root of 83299981 is about 436.7319526987.

The spelling of 83299981 in words is "eighty-three million, two hundred ninety-nine thousand, nine hundred eighty-one".