1223960861 has 2 divisors, whose sum is σ = 1223960862. Its totient is φ = 1223960860.

The previous prime is 1223960833. The next prime is 1223960873. The reversal of 1223960861 is 1680693221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 893412100 + 330548761 = 29890^2 + 18181^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223960861 - 2⁶ = 1223960797 is a prime.

It is a super-2 number, since 2×1223960861² = 2996160378519722642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223960161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611980430 + 611980431.

It is an arithmetic number, because the mean of its divisors is an integer number (611980431).

Almost surely, 2^1223960861 is an apocalyptic number.

It is an amenable number.

1223960861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223960861 is an equidigital number, since it uses as much as digits as its factorization.

1223960861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 1223960861 is about 34985.1520076732. The cubic root of 1223960861 is about 1069.6848464811.

The spelling of 1223960861 in words is "one billion, two hundred twenty-three million, nine hundred sixty thousand, eight hundred sixty-one".