1222156516 has 12 divisors (see below), whose sum is σ = 2444313088. Its totient is φ = 523781352.

The previous prime is 1222156501. The next prime is 1222156517. The reversal of 1222156516 is 6156512221.

1222156516 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1222156517) 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, 21824196 + ... + 21824251.

Almost surely, 2^1222156516 is an apocalyptic number.

It is an amenable number.

1222156516 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222156516 is a wasteful number, since it uses less digits than its factorization.

1222156516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43648458 (or 43648456 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 1222156516 is about 34959.3552000033. The cubic root of 1222156516 is about 1069.1589501131.

Adding to 1222156516 its reverse (6156512221), we get a palindrome (7378668737).

The spelling of 1222156516 in words is "one billion, two hundred twenty-two million, one hundred fifty-six thousand, five hundred sixteen".