100209691 has 2 divisors, whose sum is σ = 100209692. Its totient is φ = 100209690.

The previous prime is 100209647. The next prime is 100209709. The reversal of 100209691 is 196902001.

It is a strong prime.

It is an emirp because it is prime and its reverse (196902001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100209691 - 2⁷ = 100209563 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100209601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50104845 + 50104846.

It is an arithmetic number, because the mean of its divisors is an integer number (50104846).

Almost surely, 2^100209691 is an apocalyptic number.

100209691 is a deficient number, since it is larger than the sum of its proper divisors (1).

100209691 is an equidigital number, since it uses as much as digits as its factorization.

100209691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 100209691 is about 10010.4790594656. The cubic root of 100209691 is about 464.4830899908.

The spelling of 100209691 in words is "one hundred million, two hundred nine thousand, six hundred ninety-one".