220194991 has 2 divisors, whose sum is σ = 220194992. Its totient is φ = 220194990.

The previous prime is 220194983. The next prime is 220195039. The reversal of 220194991 is 199491022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220194991 - 2³ = 220194983 is a prime.

It is a super-2 number, since 2×220194991² = 96971668122980162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220194991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220194901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110097495 + 110097496.

It is an arithmetic number, because the mean of its divisors is an integer number (110097496).

Almost surely, 2^220194991 is an apocalyptic number.

220194991 is a deficient number, since it is larger than the sum of its proper divisors (1).

220194991 is an equidigital number, since it uses as much as digits as its factorization.

220194991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 220194991 is about 14838.9686636235. The cubic root of 220194991 is about 603.8593730984.

The spelling of 220194991 in words is "two hundred twenty million, one hundred ninety-four thousand, nine hundred ninety-one".