81799463 has 2 divisors, whose sum is σ = 81799464. Its totient is φ = 81799462.

The previous prime is 81799451. The next prime is 81799499. The reversal of 81799463 is 36499718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81799463 - 2¹⁸ = 81537319 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81799433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40899731 + 40899732.

It is an arithmetic number, because the mean of its divisors is an integer number (40899732).

Almost surely, 2^81799463 is an apocalyptic number.

81799463 is a deficient number, since it is larger than the sum of its proper divisors (1).

81799463 is an equidigital number, since it uses as much as digits as its factorization.

81799463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 81799463 is about 9044.3055565367. The cubic root of 81799463 is about 434.0937012319.

The spelling of 81799463 in words is "eighty-one million, seven hundred ninety-nine thousand, four hundred sixty-three".