1000000009691 has 2 divisors, whose sum is σ = 1000000009692. Its totient is φ = 1000000009690.

The previous prime is 1000000009651. The next prime is 1000000009703. The reversal of 1000000009691 is 1969000000001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1000000009691 - 2⁶ = 1000000009627 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000000009691.

It is not a weakly prime, because it can be changed into another prime (1000000009651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500000004845 + 500000004846.

It is an arithmetic number, because the mean of its divisors is an integer number (500000004846).

Almost surely, 2^{1000000009691} is an apocalyptic number.

1000000009691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000000009691 is an equidigital number, since it uses as much as digits as its factorization.

1000000009691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 26.

Adding to 1000000009691 its reverse (1969000000001), we get a palindrome (2969000009692).

The spelling of 1000000009691 in words is "one trillion, nine thousand, six hundred ninety-one".