1212191 has 2 divisors, whose sum is σ = 1212192. Its totient is φ = 1212190.

The previous prime is 1212187. The next prime is 1212199. The reversal of 1212191 is 1912121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1912121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212191 - 2² = 1212187 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606095 + 606096.

It is an arithmetic number, because the mean of its divisors is an integer number (606096).

2^1212191 is an apocalyptic number.

1212191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212191 is an equidigital number, since it uses as much as digits as its factorization.

1212191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 17.

The square root of 1212191 is about 1100.9954586646. The cubic root of 1212191 is about 106.6245026495.

It can be divided in two parts, 12121 and 91, that multiplied together give a palindrome (1103011).

The spelling of 1212191 in words is "one million, two hundred twelve thousand, one hundred ninety-one".