222091391 has 2 divisors, whose sum is σ = 222091392. Its totient is φ = 222091390.

The previous prime is 222091379. The next prime is 222091411. The reversal of 222091391 is 193190222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222091391 - 2⁶ = 222091327 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 (222091351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111045695 + 111045696.

It is an arithmetic number, because the mean of its divisors is an integer number (111045696).

Almost surely, 2^222091391 is an apocalyptic number.

222091391 is a deficient number, since it is larger than the sum of its proper divisors (1).

222091391 is an equidigital number, since it uses as much as digits as its factorization.

222091391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 222091391 is about 14902.7309913318. The cubic root of 222091391 is about 605.5879728882.

The spelling of 222091391 in words is "two hundred twenty-two million, ninety-one thousand, three hundred ninety-one".