18282931861 has 2 divisors, whose sum is σ = 18282931862. Its totient is φ = 18282931860.

The previous prime is 18282931853. The next prime is 18282931871. The reversal of 18282931861 is 16813928281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17904045636 + 378886225 = 133806^2 + 19465^2 .

It is an emirp because it is prime and its reverse (16813928281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18282931861 - 2³ = 18282931853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18282931871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9141465930 + 9141465931.

It is an arithmetic number, because the mean of its divisors is an integer number (9141465931).

Almost surely, 2^18282931861 is an apocalyptic number.

It is an amenable number.

18282931861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18282931861 is an equidigital number, since it uses as much as digits as its factorization.

18282931861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 49.

The spelling of 18282931861 in words is "eighteen billion, two hundred eighty-two million, nine hundred thirty-one thousand, eight hundred sixty-one".