1200191 has 2 divisors, whose sum is σ = 1200192. Its totient is φ = 1200190.

The previous prime is 1200187. The next prime is 1200233. The reversal of 1200191 is 1910021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1200191 - 2² = 1200187 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600095 + 600096.

It is an arithmetic number, because the mean of its divisors is an integer number (600096).

2^1200191 is an apocalyptic number.

1200191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200191 is an equidigital number, since it uses as much as digits as its factorization.

1200191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1200191 is about 1095.5322907153. The cubic root of 1200191 is about 106.2714946132.

The spelling of 1200191 in words is "one million, two hundred thousand, one hundred ninety-one".