100445281 has 2 divisors, whose sum is σ = 100445282. Its totient is φ = 100445280.

The previous prime is 100445273. The next prime is 100445309. The reversal of 100445281 is 182544001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90554256 + 9891025 = 9516^2 + 3145^2 .

It is a cyclic number.

It is not a de Polignac number, because 100445281 - 2³ = 100445273 is a prime.

It is a super-2 number, since 2×100445281² = 20178508950337922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100445581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50222640 + 50222641.

It is an arithmetic number, because the mean of its divisors is an integer number (50222641).

Almost surely, 2^100445281 is an apocalyptic number.

It is an amenable number.

100445281 is a deficient number, since it is larger than the sum of its proper divisors (1).

100445281 is an equidigital number, since it uses as much as digits as its factorization.

100445281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 100445281 is about 10022.2393206309. The cubic root of 100445281 is about 464.8468004205.

Subtracting from 100445281 its product of nonzero digits (1280), we obtain a palindrome (100444001).

Adding to 100445281 its reverse (182544001), we get a palindrome (282989282).

The spelling of 100445281 in words is "one hundred million, four hundred forty-five thousand, two hundred eighty-one".