101821859 has 2 divisors, whose sum is σ = 101821860. Its totient is φ = 101821858.

The previous prime is 101821847. The next prime is 101821903. The reversal of 101821859 is 958128101.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101821859 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (101821259) 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, 50910929 + 50910930.

It is an arithmetic number, because the mean of its divisors is an integer number (50910930).

Almost surely, 2^101821859 is an apocalyptic number.

101821859 is a deficient number, since it is larger than the sum of its proper divisors (1).

101821859 is an equidigital number, since it uses as much as digits as its factorization.

101821859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 101821859 is about 10090.6817906423. The cubic root of 101821859 is about 466.9607099813.

The spelling of 101821859 in words is "one hundred one million, eight hundred twenty-one thousand, eight hundred fifty-nine".