220781281 has 8 divisors (see below), whose sum is σ = 256088000. Its totient is φ = 186416208.

The previous prime is 220781279. The next prime is 220781291. The reversal of 220781281 is 182187022.

220781281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 220781281 - 2¹ = 220781279 is a prime.

It is a super-2 number, since 2×220781281² = 97488748080001922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (220781251) 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, 234906 + ... + 235843.

It is an arithmetic number, because the mean of its divisors is an integer number (32011000).

Almost surely, 2^220781281 is an apocalyptic number.

It is an amenable number.

220781281 is a deficient number, since it is larger than the sum of its proper divisors (35306719).

220781281 is an equidigital number, since it uses as much as digits as its factorization.

220781281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470823.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 220781281 is about 14858.7106102784. The cubic root of 220781281 is about 604.3948423742.

The spelling of 220781281 in words is "two hundred twenty million, seven hundred eighty-one thousand, two hundred eighty-one".