100020889 has 2 divisors, whose sum is σ = 100020890. Its totient is φ = 100020888.

The previous prime is 100020887. The next prime is 100020917. The reversal of 100020889 is 988020001.

It is an a-pointer prime, because the next prime (100020917) can be obtained adding 100020889 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79923600 + 20097289 = 8940^2 + 4483^2 .

It is a cyclic number.

It is not a de Polignac number, because 100020889 - 2¹ = 100020887 is a prime.

Together with 100020887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (100020887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010444 + 50010445.

It is an arithmetic number, because the mean of its divisors is an integer number (50010445).

Almost surely, 2^100020889 is an apocalyptic number.

It is an amenable number.

100020889 is a deficient number, since it is larger than the sum of its proper divisors (1).

100020889 is an equidigital number, since it uses as much as digits as its factorization.

100020889 is an odious number, because the sum of its binary digits is odd.

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

The square root of 100020889 is about 10001.0443954619. The cubic root of 100020889 is about 464.1912004942.

It can be divided in two parts, 100020 and 889, that multiplied together give a triangular number (88917780 = T₁₃₃₃₅).

The spelling of 100020889 in words is "one hundred million, twenty thousand, eight hundred eighty-nine".