222816491 has 4 divisors (see below), whose sum is σ = 222847800. Its totient is φ = 222785184.

The previous prime is 222816487. The next prime is 222816511. The reversal of 222816491 is 194618222.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 194618222 = 2 ⋅97309111.

It is a cyclic number.

It is not a de Polignac number, because 222816491 - 2² = 222816487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222816091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755 + ... + 21123.

It is an arithmetic number, because the mean of its divisors is an integer number (55711950).

Almost surely, 2^222816491 is an apocalyptic number.

222816491 is a deficient number, since it is larger than the sum of its proper divisors (31309).

222816491 is a wasteful number, since it uses less digits than its factorization.

222816491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31308.

The product of its digits is 13824, while the sum is 35.

The square root of 222816491 is about 14927.0389227067. The cubic root of 222816491 is about 606.2463127136.

The spelling of 222816491 in words is "two hundred twenty-two million, eight hundred sixteen thousand, four hundred ninety-one".