312122222 has 4 divisors (see below), whose sum is σ = 468183336. Its totient is φ = 156061110.

The previous prime is 312122221. The next prime is 312122287. The reversal of 312122222 is 222221213.

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

It is a self number, because there is not a number n which added to its sum of digits gives 312122222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312122221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78030554 + ... + 78030557.

It is an arithmetic number, because the mean of its divisors is an integer number (117045834).

Almost surely, 2^312122222 is an apocalyptic number.

312122222 is a deficient number, since it is larger than the sum of its proper divisors (156061114).

312122222 is a wasteful number, since it uses less digits than its factorization.

312122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156061113.

The product of its digits is 192, while the sum is 17.

The square root of 312122222 is about 17666.9811229876. The cubic root of 312122222 is about 678.3308412811.

Adding to 312122222 its reverse (222221213), we get a palindrome (534343435).

The spelling of 312122222 in words is "three hundred twelve million, one hundred twenty-two thousand, two hundred twenty-two".