101800858 has 4 divisors (see below), whose sum is σ = 152701290. Its totient is φ = 50900428.

The previous prime is 101800849. The next prime is 101800859. The reversal of 101800858 is 858008101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 858008101 = 83 ⋅10337447.

It can be written as a sum of positive squares in only one way, i.e., 72131049 + 29669809 = 8493^2 + 5447^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (101800859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25450213 + ... + 25450216.

Almost surely, 2^101800858 is an apocalyptic number.

101800858 is a deficient number, since it is larger than the sum of its proper divisors (50900432).

101800858 is an equidigital number, since it uses as much as digits as its factorization.

101800858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50900431.

The product of its (nonzero) digits is 2560, while the sum is 31.

The square root of 101800858 is about 10089.6411234493. The cubic root of 101800858 is about 466.9286038558.

Adding to 101800858 its reverse (858008101), we get a palindrome (959808959).

The spelling of 101800858 in words is "one hundred one million, eight hundred thousand, eight hundred fifty-eight".