222318731 has 4 divisors (see below), whose sum is σ = 223077792. Its totient is φ = 221559672.

The previous prime is 222318721. The next prime is 222318739. The reversal of 222318731 is 137813222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 222318731 - 2¹⁴ = 222302347 is a prime.

It is a super-2 number, since 2×222318731² = 98851236306900722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222318694 and 222318703.

It is not an unprimeable number, because it can be changed into a prime (222318739) 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, 379091 + ... + 379676.

It is an arithmetic number, because the mean of its divisors is an integer number (55769448).

Almost surely, 2^222318731 is an apocalyptic number.

222318731 is a deficient number, since it is larger than the sum of its proper divisors (759061).

222318731 is an equidigital number, since it uses as much as digits as its factorization.

222318731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759060.

The product of its digits is 4032, while the sum is 29.

The square root of 222318731 is about 14910.3565014389. The cubic root of 222318731 is about 605.7945356308.

The spelling of 222318731 in words is "two hundred twenty-two million, three hundred eighteen thousand, seven hundred thirty-one".