81673703 has 2 divisors, whose sum is σ = 81673704. Its totient is φ = 81673702.

The previous prime is 81673687. The next prime is 81673717. The reversal of 81673703 is 30737618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81673703 - 2⁴ = 81673687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81673793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40836851 + 40836852.

It is an arithmetic number, because the mean of its divisors is an integer number (40836852).

Almost surely, 2^81673703 is an apocalyptic number.

81673703 is a deficient number, since it is larger than the sum of its proper divisors (1).

81673703 is an equidigital number, since it uses as much as digits as its factorization.

81673703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 81673703 is about 9037.3504413628. The cubic root of 81673703 is about 433.8711259138.

The spelling of 81673703 in words is "eighty-one million, six hundred seventy-three thousand, seven hundred three".