18500101 has 4 divisors (see below), whose sum is σ = 18607212. Its totient is φ = 18392992.

The previous prime is 18500089. The next prime is 18500113. The reversal of 18500101 is 10100581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10100581 = 53 ⋅190577.

It is an interprime number because it is at equal distance from previous prime (18500089) and next prime (18500113).

It can be written as a sum of positive squares in 2 ways, for example, as 12744900 + 5755201 = 3570^2 + 2399^2 .

It is a cyclic number.

It is not a de Polignac number, because 18500101 - 2²¹ = 16402949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18500161) 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, 53296 + ... + 53641.

It is an arithmetic number, because the mean of its divisors is an integer number (4651803).

Almost surely, 2^18500101 is an apocalyptic number.

It is an amenable number.

18500101 is a deficient number, since it is larger than the sum of its proper divisors (107111).

18500101 is a wasteful number, since it uses less digits than its factorization.

18500101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107110.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 18500101 is about 4301.1743745168. The cubic root of 18500101 is about 264.4791049373.

Adding to 18500101 its reverse (10100581), we get a palindrome (28600682).

The spelling of 18500101 in words is "eighteen million, five hundred thousand, one hundred one".