220307891 has 2 divisors, whose sum is σ = 220307892. Its totient is φ = 220307890.

The previous prime is 220307873. The next prime is 220307897. The reversal of 220307891 is 198703022.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220307891 - 2⁶ = 220307827 is a prime.

It is not a weakly prime, because it can be changed into another prime (220307897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110153945 + 110153946.

It is an arithmetic number, because the mean of its divisors is an integer number (110153946).

Almost surely, 2^220307891 is an apocalyptic number.

220307891 is a deficient number, since it is larger than the sum of its proper divisors (1).

220307891 is an equidigital number, since it uses as much as digits as its factorization.

220307891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 220307891 is about 14842.7723488572. The cubic root of 220307891 is about 603.9625605421.

The spelling of 220307891 in words is "two hundred twenty million, three hundred seven thousand, eight hundred ninety-one".