100620809 has 2 divisors, whose sum is σ = 100620810. Its totient is φ = 100620808.

The previous prime is 100620763. The next prime is 100620811. The reversal of 100620809 is 908026001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100560784 + 60025 = 10028^2 + 245^2 .

It is an emirp because it is prime and its reverse (908026001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100620809 - 2¹² = 100616713 is a prime.

Together with 100620811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100620859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50310404 + 50310405.

It is an arithmetic number, because the mean of its divisors is an integer number (50310405).

Almost surely, 2^100620809 is an apocalyptic number.

It is an amenable number.

100620809 is a deficient number, since it is larger than the sum of its proper divisors (1).

100620809 is an equidigital number, since it uses as much as digits as its factorization.

100620809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 100620809 is about 10030.9924234843. The cubic root of 100620809 is about 465.1174159112.

The spelling of 100620809 in words is "one hundred million, six hundred twenty thousand, eight hundred nine".