101880809 has 2 divisors, whose sum is σ = 101880810. Its totient is φ = 101880808.

The previous prime is 101880781. The next prime is 101880817. The reversal of 101880809 is 908088101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75203584 + 26677225 = 8672^2 + 5165^2 .

It is a cyclic number.

It is not a de Polignac number, because 101880809 - 2²⁰ = 100832233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (101870809) 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, 50940404 + 50940405.

It is an arithmetic number, because the mean of its divisors is an integer number (50940405).

Almost surely, 2^101880809 is an apocalyptic number.

It is an amenable number.

101880809 is a deficient number, since it is larger than the sum of its proper divisors (1).

101880809 is an equidigital number, since it uses as much as digits as its factorization.

101880809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 101880809 is about 10093.6023797255. The cubic root of 101880809 is about 467.0508085891.

The spelling of 101880809 in words is "one hundred one million, eight hundred eighty thousand, eight hundred nine".