222156979 has 4 divisors (see below), whose sum is σ = 242353080. Its totient is φ = 201960880.

The previous prime is 222156971. The next prime is 222156989. The reversal of 222156979 is 979651222.

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

It is not a de Polignac number, because 222156979 - 2³ = 222156971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222156971) 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, 10098034 + ... + 10098055.

It is an arithmetic number, because the mean of its divisors is an integer number (60588270).

Almost surely, 2^222156979 is an apocalyptic number.

222156979 is a deficient number, since it is larger than the sum of its proper divisors (20196101).

222156979 is a wasteful number, since it uses less digits than its factorization.

222156979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20196100.

The product of its digits is 136080, while the sum is 43.

The square root of 222156979 is about 14904.9313651556. The cubic root of 222156979 is about 605.6475810739.

The spelling of 222156979 in words is "two hundred twenty-two million, one hundred fifty-six thousand, nine hundred seventy-nine".