220638191 has 8 divisors (see below), whose sum is σ = 229498368. Its totient is φ = 211887000.

The previous prime is 220638107. The next prime is 220638221. The reversal of 220638191 is 191836022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220638191 is a prime.

It is a super-2 number, since 2×220638191² = 97362422655504962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220638391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23105 + ... + 31226.

It is an arithmetic number, because the mean of its divisors is an integer number (28687296).

Almost surely, 2^220638191 is an apocalyptic number.

220638191 is a deficient number, since it is larger than the sum of its proper divisors (8860177).

220638191 is a wasteful number, since it uses less digits than its factorization.

220638191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54493.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 220638191 is about 14853.8948091065. The cubic root of 220638191 is about 604.2642432163.

The spelling of 220638191 in words is "two hundred twenty million, six hundred thirty-eight thousand, one hundred ninety-one".