101818981 has 4 divisors (see below), whose sum is σ = 111075264. Its totient is φ = 92562700.

The previous prime is 101818979. The next prime is 101818991. The reversal of 101818981 is 189818101.

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 101818981 - 2¹ = 101818979 is a prime.

It is a super-2 number, since 2×101818981² = 20734209783756722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101818981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101818961) 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 3 ways as a sum of consecutive naturals, for example, 4628125 + ... + 4628146.

It is an arithmetic number, because the mean of its divisors is an integer number (27768816).

Almost surely, 2^101818981 is an apocalyptic number.

101818981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

101818981 is a deficient number, since it is larger than the sum of its proper divisors (9256283).

101818981 is an equidigital number, since it uses as much as digits as its factorization.

101818981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9256282.

The product of its (nonzero) digits is 4608, while the sum is 37.

The square root of 101818981 is about 10090.5391828187. The cubic root of 101818981 is about 466.9563103838.

The spelling of 101818981 in words is "one hundred one million, eight hundred eighteen thousand, nine hundred eighty-one".