1865836913 has 2 divisors, whose sum is σ = 1865836914. Its totient is φ = 1865836912.

The previous prime is 1865836891. The next prime is 1865836927. The reversal of 1865836913 is 3196385681.

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., 1829016289 + 36820624 = 42767^2 + 6068^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865836913 - 2²⁰ = 1864788337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1865836943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932918456 + 932918457.

It is an arithmetic number, because the mean of its divisors is an integer number (932918457).

Almost surely, 2^1865836913 is an apocalyptic number.

It is an amenable number.

1865836913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865836913 is an equidigital number, since it uses as much as digits as its factorization.

1865836913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 50.

The square root of 1865836913 is about 43195.3343892601. The cubic root of 1865836913 is about 1231.0940346544.

The spelling of 1865836913 in words is "one billion, eight hundred sixty-five million, eight hundred thirty-six thousand, nine hundred thirteen".