82170001 has 4 divisors (see below), whose sum is σ = 82967872. Its totient is φ = 81372132.

The previous prime is 82169987. The next prime is 82170019. The reversal of 82170001 is 10007128.

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 82170001 - 2²¹ = 80072849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82170031) 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, 398781 + ... + 398986.

It is an arithmetic number, because the mean of its divisors is an integer number (20741968).

Almost surely, 2^82170001 is an apocalyptic number.

It is an amenable number.

82170001 is a deficient number, since it is larger than the sum of its proper divisors (797871).

82170001 is a wasteful number, since it uses less digits than its factorization.

82170001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797870.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 82170001 is about 9064.7670130015. The cubic root of 82170001 is about 434.7481714996.

Adding to 82170001 its reverse (10007128), we get a palindrome (92177129).

The spelling of 82170001 in words is "eighty-two million, one hundred seventy thousand, one".