220219991 has 2 divisors, whose sum is σ = 220219992. Its totient is φ = 220219990.

The previous prime is 220219949. The next prime is 220220053. The reversal of 220219991 is 199912022.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220219991 is a prime.

It is a Sophie Germain 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 (220219091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110109995 + 110109996.

It is an arithmetic number, because the mean of its divisors is an integer number (110109996).

Almost surely, 2^220219991 is an apocalyptic number.

220219991 is a deficient number, since it is larger than the sum of its proper divisors (1).

220219991 is an equidigital number, since it uses as much as digits as its factorization.

220219991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 220219991 is about 14839.8110163169. The cubic root of 220219991 is about 603.8822254394.

The spelling of 220219991 in words is "two hundred twenty million, two hundred nineteen thousand, nine hundred ninety-one".