220893961 has 4 divisors (see below), whose sum is σ = 220944132. Its totient is φ = 220843792.

The previous prime is 220893949. The next prime is 220893979. The reversal of 220893961 is 169398022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169398022 = 2 ⋅84699011.

It can be written as a sum of positive squares in 2 ways, for example, as 100881936 + 120012025 = 10044^2 + 10955^2 .

It is a cyclic number.

It is not a de Polignac number, because 220893961 - 2⁷ = 220893833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220893931) 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, 17770 + ... + 27523.

It is an arithmetic number, because the mean of its divisors is an integer number (55236033).

Almost surely, 2^220893961 is an apocalyptic number.

It is an amenable number.

220893961 is a deficient number, since it is larger than the sum of its proper divisors (50171).

220893961 is an equidigital number, since it uses as much as digits as its factorization.

220893961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50170.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 220893961 is about 14862.5018418838. The cubic root of 220893961 is about 604.4976464221.

It can be divided in two parts, 2208 and 93961, that added together give a palindrome (96169).

The spelling of 220893961 in words is "two hundred twenty million, eight hundred ninety-three thousand, nine hundred sixty-one".