1111111691 has 2 divisors, whose sum is σ = 1111111692. Its totient is φ = 1111111690.

The previous prime is 1111111681. The next prime is 1111111693. The reversal of 1111111691 is 1961111111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1111111691 - 2⁶ = 1111111627 is a prime.

It is a Sophie Germain prime.

Together with 1111111693, 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 (1111111693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555555845 + 555555846.

It is an arithmetic number, because the mean of its divisors is an integer number (555555846).

Almost surely, 2^1111111691 is an apocalyptic number.

1111111691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111111691 is an equidigital number, since it uses as much as digits as its factorization.

1111111691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 23.

The square root of 1111111691 is about 33333.3420316655. The cubic root of 1111111691 is about 1035.7443488362.

The spelling of 1111111691 in words is "one billion, one hundred eleven million, one hundred eleven thousand, six hundred ninety-one".