11917211 has 2 divisors, whose sum is σ = 11917212. Its totient is φ = 11917210.

The previous prime is 11917207. The next prime is 11917249. The reversal of 11917211 is 11271911.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11917211 - 2² = 11917207 is a prime.

It is not a weakly prime, because it can be changed into another prime (11917271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5958605 + 5958606.

It is an arithmetic number, because the mean of its divisors is an integer number (5958606).

Almost surely, 2^11917211 is an apocalyptic number.

11917211 is a deficient number, since it is larger than the sum of its proper divisors (1).

11917211 is an equidigital number, since it uses as much as digits as its factorization.

11917211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 23.

The square root of 11917211 is about 3452.1313706173. The cubic root of 11917211 is about 228.4151344658.

The spelling of 11917211 in words is "eleven million, nine hundred seventeen thousand, two hundred eleven".