81734773 has 2 divisors, whose sum is σ = 81734774. Its totient is φ = 81734772.

The previous prime is 81734767. The next prime is 81734797. The reversal of 81734773 is 37743718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63011844 + 18722929 = 7938^2 + 4327^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81734773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81734273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40867386 + 40867387.

It is an arithmetic number, because the mean of its divisors is an integer number (40867387).

Almost surely, 2^81734773 is an apocalyptic number.

It is an amenable number.

81734773 is a deficient number, since it is larger than the sum of its proper divisors (1).

81734773 is an equidigital number, since it uses as much as digits as its factorization.

81734773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 40.

The square root of 81734773 is about 9040.7285657739. The cubic root of 81734773 is about 433.9792386736.

The spelling of 81734773 in words is "eighty-one million, seven hundred thirty-four thousand, seven hundred seventy-three".