1223649881 has 8 divisors (see below), whose sum is σ = 1242201600. Its totient is φ = 1205174880.

The previous prime is 1223649811. The next prime is 1223649901. The reversal of 1223649881 is 1889463221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223649881 is a prime.

It is a super-2 number, since 2×1223649881² = 2994638062542628322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223649811) 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 7 ways as a sum of consecutive naturals, for example, 13376 + ... + 51246.

It is an arithmetic number, because the mean of its divisors is an integer number (155275200).

Almost surely, 2^1223649881 is an apocalyptic number.

It is an amenable number.

1223649881 is a deficient number, since it is larger than the sum of its proper divisors (18551719).

1223649881 is an equidigital number, since it uses as much as digits as its factorization.

1223649881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38359.

The product of its digits is 165888, while the sum is 44.

The square root of 1223649881 is about 34980.7072684358. The cubic root of 1223649881 is about 1069.5942447903.

The spelling of 1223649881 in words is "one billion, two hundred twenty-three million, six hundred forty-nine thousand, eight hundred eighty-one".