100553 has 4 divisors (see below), whose sum is σ = 101268. Its totient is φ = 99840.
The previous prime is 100549. The next prime is 100559. The reversal of 100553 is 355001.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 355001 = 151 ⋅2351.
It can be written as a sum of positive squares in 2 ways, for example, as 26569 + 73984 = 163^2 + 272^2 .
It is a cyclic number.
It is not a de Polignac number, because 100553 - 22 = 100549 is a prime.
It is a super-2 number, since 2×1005532 = 20221811618, which contains 22 as substring.
It is a Duffinian number.
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (100559) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68 + ... + 453.
It is an arithmetic number, because the mean of its divisors is an integer number (25317).
2100553 is an apocalyptic number.
It is an amenable number.
100553 is a deficient number, since it is larger than the sum of its proper divisors (715).
100553 is an equidigital number, since it uses as much as digits as its factorization.
100553 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 714.
The product of its (nonzero) digits is 75, while the sum is 14.
The square root of 100553 is about 317.1009303045. The cubic root of 100553 is about 46.5012910575.
Adding to 100553 its reverse (355001), we get a palindrome (455554).
The spelling of 100553 in words is "one hundred thousand, five hundred fifty-three".
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