81035673 has 4 divisors (see below), whose sum is σ = 108047568. Its totient is φ = 54023780.

The previous prime is 81035671. The next prime is 81035681. The reversal of 81035673 is 37653018.

It is a happy number.

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 81035673 - 2¹ = 81035671 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81035671) 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 in 3 ways as a sum of consecutive naturals, for example, 13505943 + ... + 13505948.

It is an arithmetic number, because the mean of its divisors is an integer number (27011892).

Almost surely, 2^81035673 is an apocalyptic number.

It is an amenable number.

81035673 is a deficient number, since it is larger than the sum of its proper divisors (27011895).

81035673 is a wasteful number, since it uses less digits than its factorization.

81035673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27011894.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 81035673 is about 9001.9816151778. The cubic root of 81035673 is about 432.7383795094.

The spelling of 81035673 in words is "eighty-one million, thirty-five thousand, six hundred seventy-three".