1866231313 has 2 divisors, whose sum is σ = 1866231314. Its totient is φ = 1866231312.

The previous prime is 1866231259. The next prime is 1866231329. The reversal of 1866231313 is 3131326681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1061260929 + 804970384 = 32577^2 + 28372^2 .

It is a cyclic number.

It is not a de Polignac number, because 1866231313 - 2⁹ = 1866230801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1866231383) 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, 933115656 + 933115657.

It is an arithmetic number, because the mean of its divisors is an integer number (933115657).

Almost surely, 2^1866231313 is an apocalyptic number.

It is an amenable number.

1866231313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866231313 is an equidigital number, since it uses as much as digits as its factorization.

1866231313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 1866231313 is about 43199.8994559015. The cubic root of 1866231313 is about 1231.1807712955.

Adding to 1866231313 its reverse (3131326681), we get a palindrome (4997557994).

The spelling of 1866231313 in words is "one billion, eight hundred sixty-six million, two hundred thirty-one thousand, three hundred thirteen".