222685381 has 2 divisors, whose sum is σ = 222685382. Its totient is φ = 222685380.

The previous prime is 222685373. The next prime is 222685409. The reversal of 222685381 is 183586222.

222685381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178462881 + 44222500 = 13359^2 + 6650^2 .

It is a cyclic number.

It is not a de Polignac number, because 222685381 - 2³ = 222685373 is a prime.

It is a super-2 number, since 2×222685381² = 99177557822230322, 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 222685381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222685321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111342690 + 111342691.

It is an arithmetic number, because the mean of its divisors is an integer number (111342691).

Almost surely, 2^222685381 is an apocalyptic number.

It is an amenable number.

222685381 is a deficient number, since it is larger than the sum of its proper divisors (1).

222685381 is an equidigital number, since it uses as much as digits as its factorization.

222685381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 37.

The square root of 222685381 is about 14922.6465816222. The cubic root of 222685381 is about 606.1273799407.

It can be divided in two parts, 22 and 2685381, that added together give a triangular number (2685403 = T₂₃₁₇).

The spelling of 222685381 in words is "two hundred twenty-two million, six hundred eighty-five thousand, three hundred eighty-one".