1223752681 has 2 divisors, whose sum is σ = 1223752682. Its totient is φ = 1223752680.

The previous prime is 1223752661. The next prime is 1223752693. The reversal of 1223752681 is 1862573221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1074790656 + 148962025 = 32784^2 + 12205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223752681 is a prime.

It is a super-2 number, since 2×1223752681² = 2995141248509375522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1223752681.

It is not a weakly prime, because it can be changed into another prime (1223752601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611876340 + 611876341.

It is an arithmetic number, because the mean of its divisors is an integer number (611876341).

Almost surely, 2^1223752681 is an apocalyptic number.

It is an amenable number.

1223752681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223752681 is an equidigital number, since it uses as much as digits as its factorization.

1223752681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 1223752681 is about 34982.1766189584. The cubic root of 1223752681 is about 1069.6241964976.

The spelling of 1223752681 in words is "one billion, two hundred twenty-three million, seven hundred fifty-two thousand, six hundred eighty-one".