83181817 has 2 divisors, whose sum is σ = 83181818. Its totient is φ = 83181816.

The previous prime is 83181779. The next prime is 83181851. The reversal of 83181817 is 71818138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82973881 + 207936 = 9109^2 + 456^2 .

It is a cyclic number.

It is not a de Polignac number, because 83181817 - 2⁷ = 83181689 is a prime.

It is not a weakly prime, because it can be changed into another prime (83181617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41590908 + 41590909.

It is an arithmetic number, because the mean of its divisors is an integer number (41590909).

Almost surely, 2^83181817 is an apocalyptic number.

It is an amenable number.

83181817 is a deficient number, since it is larger than the sum of its proper divisors (1).

83181817 is an equidigital number, since it uses as much as digits as its factorization.

83181817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 37.

The square root of 83181817 is about 9120.4066247070. The cubic root of 83181817 is about 436.5253483484.

The spelling of 83181817 in words is "eighty-three million, one hundred eighty-one thousand, eight hundred seventeen".