81834773 has 2 divisors, whose sum is σ = 81834774. Its totient is φ = 81834772.

The previous prime is 81834751. The next prime is 81834791. The reversal of 81834773 is 37743818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78730129 + 3104644 = 8873^2 + 1762^2 .

It is a cyclic number.

It is not a de Polignac number, because 81834773 - 2⁸ = 81834517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81834773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81830773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40917386 + 40917387.

It is an arithmetic number, because the mean of its divisors is an integer number (40917387).

Almost surely, 2^81834773 is an apocalyptic number.

It is an amenable number.

81834773 is a deficient number, since it is larger than the sum of its proper divisors (1).

81834773 is an equidigital number, since it uses as much as digits as its factorization.

81834773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 41.

The square root of 81834773 is about 9046.2574029264. The cubic root of 81834773 is about 434.1561533274.

The spelling of 81834773 in words is "eighty-one million, eight hundred thirty-four thousand, seven hundred seventy-three".