1223456761 has 2 divisors, whose sum is σ = 1223456762. Its totient is φ = 1223456760.

The previous prime is 1223456753. The next prime is 1223456807. The reversal of 1223456761 is 1676543221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1054950400 + 168506361 = 32480^2 + 12981^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223456761 - 2³ = 1223456753 is a prime.

It is a super-2 number, since 2×1223456761² = 2993692892073222242, 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 1223456761.

It is not a weakly prime, because it can be changed into another prime (1223456161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611728380 + 611728381.

It is an arithmetic number, because the mean of its divisors is an integer number (611728381).

Almost surely, 2^1223456761 is an apocalyptic number.

It is an amenable number.

1223456761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223456761 is an equidigital number, since it uses as much as digits as its factorization.

1223456761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 37.

The square root of 1223456761 is about 34977.9467807932. The cubic root of 1223456761 is about 1069.5379730001.

Adding to 1223456761 its reverse (1676543221), we get a palindrome (2899999982).

The spelling of 1223456761 in words is "one billion, two hundred twenty-three million, four hundred fifty-six thousand, seven hundred sixty-one".