19661233 has 2 divisors, whose sum is σ = 19661234. Its totient is φ = 19661232.

The previous prime is 19661207. The next prime is 19661237. The reversal of 19661233 is 33216691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15944049 + 3717184 = 3993^2 + 1928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19661233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19661195 and 19661204.

It is not a weakly prime, because it can be changed into another prime (19661237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9830616 + 9830617.

It is an arithmetic number, because the mean of its divisors is an integer number (9830617).

Almost surely, 2^19661233 is an apocalyptic number.

It is an amenable number.

19661233 is a deficient number, since it is larger than the sum of its proper divisors (1).

19661233 is an equidigital number, since it uses as much as digits as its factorization.

19661233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 19661233 is about 4434.0988938002. The cubic root of 19661233 is about 269.9004342532.

The spelling of 19661233 in words is "nineteen million, six hundred sixty-one thousand, two hundred thirty-three".