222999961 has 4 divisors (see below), whose sum is σ = 223030800. Its totient is φ = 222969124.

The previous prime is 222999923. The next prime is 222999989. The reversal of 222999961 is 169999222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 169999222 = 2 ⋅84999611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222999961 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222939961) 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, 1950 + ... + 21208.

It is an arithmetic number, because the mean of its divisors is an integer number (55757700).

Almost surely, 2^222999961 is an apocalyptic number.

It is an amenable number.

222999961 is a deficient number, since it is larger than the sum of its proper divisors (30839).

222999961 is a wasteful number, since it uses less digits than its factorization.

222999961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30838.

The product of its digits is 314928, while the sum is 49.

The square root of 222999961 is about 14933.1832172514. The cubic root of 222999961 is about 606.4126640993.

The spelling of 222999961 in words is "two hundred twenty-two million, nine hundred ninety-nine thousand, nine hundred sixty-one".