220499991 has 12 divisors (see below), whose sum is σ = 320152768. Its totient is φ = 146237184.

The previous prime is 220499977. The next prime is 220500019. The reversal of 220499991 is 199994022.

It is not a de Polignac number, because 220499991 - 2¹⁸ = 220237847 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 (220499971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61735 + ... + 65208.

Almost surely, 2^220499991 is an apocalyptic number.

220499991 is a deficient number, since it is larger than the sum of its proper divisors (99652777).

220499991 is a wasteful number, since it uses less digits than its factorization.

220499991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127142 (or 127139 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 220499991 is about 14849.2421018717. The cubic root of 220499991 is about 604.1380535785.

The spelling of 220499991 in words is "two hundred twenty million, four hundred ninety-nine thousand, nine hundred ninety-one".