220474981 has 2 divisors, whose sum is σ = 220474982. Its totient is φ = 220474980.

The previous prime is 220474973. The next prime is 220474997. The reversal of 220474981 is 189474022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213890625 + 6584356 = 14625^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 220474981 - 2³ = 220474973 is a prime.

It is a super-2 number, since 2×220474981² = 97218434493900722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220474981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220474931) 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 as a sum of consecutive naturals, namely, 110237490 + 110237491.

It is an arithmetic number, because the mean of its divisors is an integer number (110237491).

Almost surely, 2^220474981 is an apocalyptic number.

It is an amenable number.

220474981 is a deficient number, since it is larger than the sum of its proper divisors (1).

220474981 is an equidigital number, since it uses as much as digits as its factorization.

220474981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 220474981 is about 14848.3999474691. The cubic root of 220474981 is about 604.1152114551.

It can be divided in two parts, 22047 and 4981, that added together give a triangular number (27028 = T₂₃₂).

The spelling of 220474981 in words is "two hundred twenty million, four hundred seventy-four thousand, nine hundred eighty-one".