220548997 has 4 divisors (see below), whose sum is σ = 222822796. Its totient is φ = 218275200.

The previous prime is 220548989. The next prime is 220549003. The reversal of 220548997 is 799845022.

220548997 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.

It can be written as a sum of positive squares in 2 ways, for example, as 34117281 + 186431716 = 5841^2 + 13654^2 .

It is a cyclic number.

It is not a de Polignac number, because 220548997 - 2³ = 220548989 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 (220548917) 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, 1136754 + ... + 1136947.

It is an arithmetic number, because the mean of its divisors is an integer number (55705699).

Almost surely, 2^220548997 is an apocalyptic number.

It is an amenable number.

220548997 is a deficient number, since it is larger than the sum of its proper divisors (2273799).

220548997 is an equidigital number, since it uses as much as digits as its factorization.

220548997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273798.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 220548997 is about 14850.8921280844. The cubic root of 220548997 is about 604.1828067116.

The spelling of 220548997 in words is "two hundred twenty million, five hundred forty-eight thousand, nine hundred ninety-seven".