81916283 has 2 divisors, whose sum is σ = 81916284. Its totient is φ = 81916282.

The previous prime is 81916279. The next prime is 81916301. The reversal of 81916283 is 38261918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81916283 - 2² = 81916279 is a prime.

It is not a weakly prime, because it can be changed into another prime (81918283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40958141 + 40958142.

It is an arithmetic number, because the mean of its divisors is an integer number (40958142).

Almost surely, 2^81916283 is an apocalyptic number.

81916283 is a deficient number, since it is larger than the sum of its proper divisors (1).

81916283 is an equidigital number, since it uses as much as digits as its factorization.

81916283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 81916283 is about 9050.7614596784. The cubic root of 81916283 is about 434.3002498773.

The spelling of 81916283 in words is "eighty-one million, nine hundred sixteen thousand, two hundred eighty-three".