222145861 has 12 divisors (see below), whose sum is σ = 259313292. Its totient is φ = 189748608.

The previous prime is 222145813. The next prime is 222145871. The reversal of 222145861 is 168541222.

It can be written as a sum of positive squares in 2 ways, for example, as 161772961 + 60372900 = 12719^2 + 7770^2 .

It is not a de Polignac number, because 222145861 - 2²³ = 213757253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222145871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6621 + ... + 22093.

It is an arithmetic number, because the mean of its divisors is an integer number (21609441).

Almost surely, 2^222145861 is an apocalyptic number.

It is an amenable number.

222145861 is a deficient number, since it is larger than the sum of its proper divisors (37167431).

222145861 is a wasteful number, since it uses less digits than its factorization.

222145861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15780 (or 15773 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 222145861 is about 14904.5583966785. The cubic root of 222145861 is about 605.6374775544.

The spelling of 222145861 in words is "two hundred twenty-two million, one hundred forty-five thousand, eight hundred sixty-one".