81636283 has 2 divisors, whose sum is σ = 81636284. Its totient is φ = 81636282.

The previous prime is 81636281. The next prime is 81636337. The reversal of 81636283 is 38263618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81636283 - 2¹ = 81636281 is a prime.

Together with 81636281, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (81636281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40818141 + 40818142.

It is an arithmetic number, because the mean of its divisors is an integer number (40818142).

Almost surely, 2^81636283 is an apocalyptic number.

81636283 is a deficient number, since it is larger than the sum of its proper divisors (1).

81636283 is an equidigital number, since it uses as much as digits as its factorization.

81636283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 37.

The square root of 81636283 is about 9035.2799071196. The cubic root of 81636283 is about 433.8048543271.

The spelling of 81636283 in words is "eighty-one million, six hundred thirty-six thousand, two hundred eighty-three".