220998791 has 8 divisors (see below), whose sum is σ = 241901184. Its totient is φ = 200653920.

The previous prime is 220998781. The next prime is 220998803. The reversal of 220998791 is 197899022.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 220998791 - 2⁶ = 220998727 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 (220998751) 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 7 ways as a sum of consecutive naturals, for example, 138551 + ... + 140136.

It is an arithmetic number, because the mean of its divisors is an integer number (30237648).

Almost surely, 2^220998791 is an apocalyptic number.

220998791 is a deficient number, since it is larger than the sum of its proper divisors (20902393).

220998791 is a wasteful number, since it uses less digits than its factorization.

220998791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278761.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 220998791 is about 14866.0280841925. The cubic root of 220998791 is about 604.5932571036.

The spelling of 220998791 in words is "two hundred twenty million, nine hundred ninety-eight thousand, seven hundred ninety-one".