11891699 has 2 divisors, whose sum is σ = 11891700. Its totient is φ = 11891698.

The previous prime is 11891657. The next prime is 11891717. The reversal of 11891699 is 99619811.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11891699 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (11893699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5945849 + 5945850.

It is an arithmetic number, because the mean of its divisors is an integer number (5945850).

Almost surely, 2^11891699 is an apocalyptic number.

11891699 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891699 is an equidigital number, since it uses as much as digits as its factorization.

11891699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 44.

The square root of 11891699 is about 3448.4342823954. The cubic root of 11891699 is about 228.2520233099.

The spelling of 11891699 in words is "eleven million, eight hundred ninety-one thousand, six hundred ninety-nine".