1233713981 has 2 divisors, whose sum is σ = 1233713982. Its totient is φ = 1233713980.

The previous prime is 1233713927. The next prime is 1233713983. The reversal of 1233713981 is 1893173321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1033944025 + 199769956 = 32155^2 + 14134^2 .

It is a cyclic number.

It is not a de Polignac number, because 1233713981 - 2⁶ = 1233713917 is a prime.

It is a super-3 number, since 3×1233713981³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 1233713983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1233713983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616856990 + 616856991.

It is an arithmetic number, because the mean of its divisors is an integer number (616856991).

Almost surely, 2^1233713981 is an apocalyptic number.

It is an amenable number.

1233713981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1233713981 is an equidigital number, since it uses as much as digits as its factorization.

1233713981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 1233713981 is about 35124.2648463993. The cubic root of 1233713981 is about 1072.5185905714.

The spelling of 1233713981 in words is "one billion, two hundred thirty-three million, seven hundred thirteen thousand, nine hundred eighty-one".