1223248781 has 4 divisors (see below), whose sum is σ = 1230573792. Its totient is φ = 1215923772.

The previous prime is 1223248769. The next prime is 1223248867. The reversal of 1223248781 is 1878423221.

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 an emirpimes, since its reverse is a distinct semiprime: 1878423221 = 271 ⋅6931451.

It is a cyclic number.

It is not a de Polignac number, because 1223248781 - 2¹⁴ = 1223232397 is a prime.

It is a super-2 number, since 2×1223248781² = 2992675160435971922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223248181) 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, 3662255 + ... + 3662588.

It is an arithmetic number, because the mean of its divisors is an integer number (307643448).

Almost surely, 2^1223248781 is an apocalyptic number.

It is an amenable number.

1223248781 is a deficient number, since it is larger than the sum of its proper divisors (7325011).

1223248781 is an equidigital number, since it uses as much as digits as its factorization.

1223248781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7325010.

The product of its digits is 43008, while the sum is 38.

The square root of 1223248781 is about 34974.9736383031. The cubic root of 1223248781 is about 1069.4773646428.

The spelling of 1223248781 in words is "one billion, two hundred twenty-three million, two hundred forty-eight thousand, seven hundred eighty-one".