101801818 has 12 divisors (see below), whose sum is σ = 159632298. Its totient is φ = 48687320.

The previous prime is 101801809. The next prime is 101801827. The reversal of 101801818 is 818108101.

It is an interprime number because it is at equal distance from previous prime (101801809) and next prime (101801827).

It can be written as a sum of positive squares in only one way, i.e., 54508689 + 47293129 = 7383^2 + 6877^2 .

It is a super-2 number, since 2×101801818² = 20727220296210248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47053 + ... + 49168.

Almost surely, 2^101801818 is an apocalyptic number.

101801818 is a deficient number, since it is larger than the sum of its proper divisors (57830480).

101801818 is an equidigital number, since it uses as much as digits as its factorization.

101801818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96269 (or 96246 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 28.

The square root of 101801818 is about 10089.6886968826. The cubic root of 101801818 is about 466.9300715908.

Adding to 101801818 its reverse (818108101), we get a palindrome (919909919).

The spelling of 101801818 in words is "one hundred one million, eight hundred one thousand, eight hundred eighteen".