11899997 has 2 divisors, whose sum is σ = 11899998. Its totient is φ = 11899996.

The previous prime is 11899991. The next prime is 11899999. The reversal of 11899997 is 79999811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6832996 + 5067001 = 2614^2 + 2251^2 .

It is a cyclic number.

It is not a de Polignac number, because 11899997 - 2⁴ = 11899981 is a prime.

Together with 11899999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11899991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5949998 + 5949999.

It is an arithmetic number, because the mean of its divisors is an integer number (5949999).

Almost surely, 2^11899997 is an apocalyptic number.

It is an amenable number.

11899997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11899997 is an equidigital number, since it uses as much as digits as its factorization.

11899997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 53.

The square root of 11899997 is about 3449.6372273038. The cubic root of 11899997 is about 228.3051022099.

The spelling of 11899997 in words is "eleven million, eight hundred ninety-nine thousand, nine hundred ninety-seven".