220381591 has 4 divisors (see below), whose sum is σ = 233345232. Its totient is φ = 207417952.

The previous prime is 220381549. The next prime is 220381597. The reversal of 220381591 is 195183022.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 220381591 - 2⁹ = 220381079 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 (220381597) 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 in 3 ways as a sum of consecutive naturals, for example, 6481795 + ... + 6481828.

It is an arithmetic number, because the mean of its divisors is an integer number (58336308).

Almost surely, 2^220381591 is an apocalyptic number.

220381591 is a deficient number, since it is larger than the sum of its proper divisors (12963641).

220381591 is a wasteful number, since it uses less digits than its factorization.

220381591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12963640.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 220381591 is about 14845.2548310900. The cubic root of 220381591 is about 604.0299012652.

The spelling of 220381591 in words is "two hundred twenty million, three hundred eighty-one thousand, five hundred ninety-one".