222375781 has 4 divisors (see below), whose sum is σ = 222871500. Its totient is φ = 221880064.

The previous prime is 222375773. The next prime is 222375787. The reversal of 222375781 is 187573222.

222375781 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 54154881 + 168220900 = 7359^2 + 12970^2 .

It is a cyclic number.

It is not a de Polignac number, because 222375781 - 2³ = 222375773 is a prime.

It is a super-2 number, since 2×222375781² = 98901975950719922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222375781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222375787) 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, 247186 + ... + 248083.

It is an arithmetic number, because the mean of its divisors is an integer number (55717875).

Almost surely, 2^222375781 is an apocalyptic number.

It is an amenable number.

222375781 is a deficient number, since it is larger than the sum of its proper divisors (495719).

222375781 is an equidigital number, since it uses as much as digits as its factorization.

222375781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495718.

The product of its digits is 47040, while the sum is 37.

The square root of 222375781 is about 14912.2694785200. The cubic root of 222375781 is about 605.8463495622.

The spelling of 222375781 in words is "two hundred twenty-two million, three hundred seventy-five thousand, seven hundred eighty-one".