81042017 has 4 divisors (see below), whose sum is σ = 92619456. Its totient is φ = 69464580.

The previous prime is 81042007. The next prime is 81042019. The reversal of 81042017 is 71024018.

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 81042017 - 2¹⁶ = 80976481 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81041983 and 81042001.

It is not an unprimeable number, because it can be changed into a prime (81042019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5788709 + ... + 5788722.

It is an arithmetic number, because the mean of its divisors is an integer number (23154864).

Almost surely, 2^81042017 is an apocalyptic number.

It is an amenable number.

81042017 is a deficient number, since it is larger than the sum of its proper divisors (11577439).

81042017 is a wasteful number, since it uses less digits than its factorization.

81042017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11577438.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 81042017 is about 9002.3339751422. Note that the first 3 decimals coincide. The cubic root of 81042017 is about 432.7496717405.

The spelling of 81042017 in words is "eighty-one million, forty-two thousand, seventeen".