101820001 has 16 divisors (see below), whose sum is σ = 107864064. Its totient is φ = 96004944.

The previous prime is 101819989. The next prime is 101820007. The reversal of 101820001 is 100028101.

It is a cyclic number.

It is not a de Polignac number, because 101820001 - 2⁵ = 101819969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101820007) 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 15 ways as a sum of consecutive naturals, for example, 167440 + ... + 168046.

It is an arithmetic number, because the mean of its divisors is an integer number (6741504).

Almost surely, 2^101820001 is an apocalyptic number.

It is an amenable number.

101820001 is a deficient number, since it is larger than the sum of its proper divisors (6044063).

101820001 is an equidigital number, since it uses as much as digits as its factorization.

101820001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 101820001 is about 10090.5897250854. The cubic root of 101820001 is about 466.9578696669.

Adding to 101820001 its reverse (100028101), we get a palindrome (201848102).

The spelling of 101820001 in words is "one hundred one million, eight hundred twenty thousand, one".