81170673 has 4 divisors (see below), whose sum is σ = 108227568. Its totient is φ = 54113780.

The previous prime is 81170659. The next prime is 81170723. The reversal of 81170673 is 37607118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81170673 - 2⁸ = 81170417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81170773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13528443 + ... + 13528448.

It is an arithmetic number, because the mean of its divisors is an integer number (27056892).

Almost surely, 2^81170673 is an apocalyptic number.

It is an amenable number.

81170673 is a deficient number, since it is larger than the sum of its proper divisors (27056895).

81170673 is a wasteful number, since it uses less digits than its factorization.

81170673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27056894.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 81170673 is about 9009.4768438573. The cubic root of 81170673 is about 432.9785505681.

The spelling of 81170673 in words is "eighty-one million, one hundred seventy thousand, six hundred seventy-three".