1222609881 has 4 divisors (see below), whose sum is σ = 1630146512. Its totient is φ = 815073252.

The previous prime is 1222609867. The next prime is 1222609901. The reversal of 1222609881 is 1889062221.

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.

It is not a de Polignac number, because 1222609881 - 2⁵ = 1222609849 is a prime.

It is a super-2 number, since 2×1222609881² = 2989549842237668322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222609831) 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, 203768311 + ... + 203768316.

It is an arithmetic number, because the mean of its divisors is an integer number (407536628).

Almost surely, 2^1222609881 is an apocalyptic number.

It is an amenable number.

1222609881 is a deficient number, since it is larger than the sum of its proper divisors (407536631).

1222609881 is an equidigital number, since it uses as much as digits as its factorization.

1222609881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407536630.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 1222609881 is about 34965.8387715782. The cubic root of 1222609881 is about 1069.2911370349.

The spelling of 1222609881 in words is "one billion, two hundred twenty-two million, six hundred nine thousand, eight hundred eighty-one".