100144981 has 4 divisors (see below), whose sum is σ = 101786764. Its totient is φ = 98503200.

The previous prime is 100144939. The next prime is 100144999. The reversal of 100144981 is 189441001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189441001 = 19 ⋅9970579.

It can be written as a sum of positive squares in 2 ways, for example, as 1540081 + 98604900 = 1241^2 + 9930^2 .

It is a cyclic number.

It is not a de Polignac number, because 100144981 - 2⁷ = 100144853 is a prime.

It is a super-2 number, since 2×100144981² = 20058034438980722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100144901) 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, 820800 + ... + 820921.

It is an arithmetic number, because the mean of its divisors is an integer number (25446691).

Almost surely, 2^100144981 is an apocalyptic number.

It is an amenable number.

100144981 is a deficient number, since it is larger than the sum of its proper divisors (1641783).

100144981 is an equidigital number, since it uses as much as digits as its factorization.

100144981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641782.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 100144981 is about 10007.2464244666. The cubic root of 100144981 is about 464.3830891078.

Adding to 100144981 its reverse (189441001), we get a palindrome (289585982).

The spelling of 100144981 in words is "one hundred million, one hundred forty-four thousand, nine hundred eighty-one".