83802181 has 2 divisors, whose sum is σ = 83802182. Its totient is φ = 83802180.

The previous prime is 83802157. The next prime is 83802203. The reversal of 83802181 is 18120838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48874081 + 34928100 = 6991^2 + 5910^2 .

It is a cyclic number.

It is not a de Polignac number, because 83802181 - 2⁵ = 83802149 is a prime.

It is a super-2 number, since 2×83802181² = 14045611080713522, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83802101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41901090 + 41901091.

It is an arithmetic number, because the mean of its divisors is an integer number (41901091).

Almost surely, 2^83802181 is an apocalyptic number.

It is an amenable number.

83802181 is a deficient number, since it is larger than the sum of its proper divisors (1).

83802181 is an equidigital number, since it uses as much as digits as its factorization.

83802181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 83802181 is about 9154.3531175064. The cubic root of 83802181 is about 437.6078532464.

The spelling of 83802181 in words is "eighty-three million, eight hundred two thousand, one hundred eighty-one".