220005691 has 4 divisors (see below), whose sum is σ = 221048584. Its totient is φ = 218962800.

The previous prime is 220005679. The next prime is 220005701. The reversal of 220005691 is 196500022.

220005691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196500022 = 2 ⋅98250011.

It is a cyclic number.

It is not a de Polignac number, because 220005691 - 2¹³ = 219997499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220005601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521130 + ... + 521551.

It is an arithmetic number, because the mean of its divisors is an integer number (55262146).

Almost surely, 2^220005691 is an apocalyptic number.

220005691 is a deficient number, since it is larger than the sum of its proper divisors (1042893).

220005691 is a wasteful number, since it uses less digits than its factorization.

220005691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042892.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 220005691 is about 14832.5888165215. The cubic root of 220005691 is about 603.6862790121.

The spelling of 220005691 in words is "two hundred twenty million, five thousand, six hundred ninety-one".