1223975881 has 4 divisors (see below), whose sum is σ = 1224876564. Its totient is φ = 1223075200.

The previous prime is 1223975869. The next prime is 1223975897. The reversal of 1223975881 is 1885793221.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 61779600 + 1162196281 = 7860^2 + 34091^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223975881 - 2⁹ = 1223975369 is a prime.

It is a super-2 number, since 2×1223975881² = 2996233914539452322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223975681) 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, 448300 + ... + 451021.

It is an arithmetic number, because the mean of its divisors is an integer number (306219141).

Almost surely, 2^1223975881 is an apocalyptic number.

It is an amenable number.

1223975881 is a deficient number, since it is larger than the sum of its proper divisors (900683).

1223975881 is an equidigital number, since it uses as much as digits as its factorization.

1223975881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900682.

The product of its digits is 241920, while the sum is 46.

The square root of 1223975881 is about 34985.3666695091. The cubic root of 1223975881 is about 1069.6892220569.

The spelling of 1223975881 in words is "one billion, two hundred twenty-three million, nine hundred seventy-five thousand, eight hundred eighty-one".