100509691 has 2 divisors, whose sum is σ = 100509692. Its totient is φ = 100509690.

The previous prime is 100509653. The next prime is 100509697. The reversal of 100509691 is 196905001.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100509691 is a prime.

It is not a weakly prime, because it can be changed into another prime (100509697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50254845 + 50254846.

It is an arithmetic number, because the mean of its divisors is an integer number (50254846).

Almost surely, 2^100509691 is an apocalyptic number.

100509691 is a deficient number, since it is larger than the sum of its proper divisors (1).

100509691 is an equidigital number, since it uses as much as digits as its factorization.

100509691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 100509691 is about 10025.4521593791. The cubic root of 100509691 is about 464.9461393661.

The spelling of 100509691 in words is "one hundred million, five hundred nine thousand, six hundred ninety-one".