1222156801 has 4 divisors (see below), whose sum is σ = 1222251952. Its totient is φ = 1222061652.

The previous prime is 1222156787. The next prime is 1222156813. The reversal of 1222156801 is 1086512221.

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.

It is a cyclic number.

It is not a de Polignac number, because 1222156801 - 2⁵ = 1222156769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222156801.

It is not an unprimeable number, because it can be changed into a prime (1222156501) 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, 24615 + ... + 55228.

It is an arithmetic number, because the mean of its divisors is an integer number (305562988).

Almost surely, 2^1222156801 is an apocalyptic number.

It is an amenable number.

1222156801 is a deficient number, since it is larger than the sum of its proper divisors (95151).

1222156801 is an equidigital number, since it uses as much as digits as its factorization.

1222156801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95150.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 1222156801 is about 34959.3592761652. The cubic root of 1222156801 is about 1069.1590332204.

The spelling of 1222156801 in words is "one billion, two hundred twenty-two million, one hundred fifty-six thousand, eight hundred one".