1222156799 has 4 divisors (see below), whose sum is σ = 1222837200. Its totient is φ = 1221476400.

The previous prime is 1222156787. The next prime is 1222156813. The reversal of 1222156799 is 9976512221.

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

It is a cyclic number.

It is not a de Polignac number, because 1222156799 - 2⁴ = 1222156783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222156769) 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, 337499 + ... + 341100.

It is an arithmetic number, because the mean of its divisors is an integer number (305709300).

Almost surely, 2^1222156799 is an apocalyptic number.

1222156799 is a deficient number, since it is larger than the sum of its proper divisors (680401).

1222156799 is an equidigital number, since it uses as much as digits as its factorization.

1222156799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680400.

The product of its digits is 136080, while the sum is 44.

The square root of 1222156799 is about 34959.3592475606. The cubic root of 1222156799 is about 1069.1590326372.

The spelling of 1222156799 in words is "one billion, two hundred twenty-two million, one hundred fifty-six thousand, seven hundred ninety-nine".