1222002191 has 4 divisors (see below), whose sum is σ = 1231330584. Its totient is φ = 1212673800.

The previous prime is 1222002181. The next prime is 1222002241. The reversal of 1222002191 is 1912002221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1912002221 = 31 ⋅61677491.

It is a cyclic number.

It is not a de Polignac number, because 1222002191 - 2³⁰ = 148260367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222002181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4664000 + ... + 4664261.

It is an arithmetic number, because the mean of its divisors is an integer number (307832646).

Almost surely, 2^1222002191 is an apocalyptic number.

1222002191 is a deficient number, since it is larger than the sum of its proper divisors (9328393).

1222002191 is an equidigital number, since it uses as much as digits as its factorization.

1222002191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9328392.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1222002191 is about 34957.1479242801. The cubic root of 1222002191 is about 1069.1139463573.

The spelling of 1222002191 in words is "one billion, two hundred twenty-two million, two thousand, one hundred ninety-one".