81836263 has 2 divisors, whose sum is σ = 81836264. Its totient is φ = 81836262.

The previous prime is 81836239. The next prime is 81836327. The reversal of 81836263 is 36263818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81836263 - 2¹⁷ = 81705191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81836203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40918131 + 40918132.

It is an arithmetic number, because the mean of its divisors is an integer number (40918132).

Almost surely, 2^81836263 is an apocalyptic number.

81836263 is a deficient number, since it is larger than the sum of its proper divisors (1).

81836263 is an equidigital number, since it uses as much as digits as its factorization.

81836263 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 81836263 is about 9046.3397570509. The cubic root of 81836263 is about 434.1587882657.

The spelling of 81836263 in words is "eighty-one million, eight hundred thirty-six thousand, two hundred sixty-three".