865540913 has 2 divisors, whose sum is σ = 865540914. Its totient is φ = 865540912.

The previous prime is 865540903. The next prime is 865540919. The reversal of 865540913 is 319045568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 816987889 + 48553024 = 28583^2 + 6968^2 .

It is a cyclic number.

It is not a de Polignac number, because 865540913 - 2⁸ = 865540657 is a prime.

It is a super-2 number, since 2×865540913² = 1498322144153747138, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (865540919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432770456 + 432770457.

It is an arithmetic number, because the mean of its divisors is an integer number (432770457).

Almost surely, 2^865540913 is an apocalyptic number.

It is an amenable number.

865540913 is a deficient number, since it is larger than the sum of its proper divisors (1).

865540913 is an equidigital number, since it uses as much as digits as its factorization.

865540913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 865540913 is about 29420.0766994242. The cubic root of 865540913 is about 953.0065094704.

The spelling of 865540913 in words is "eight hundred sixty-five million, five hundred forty thousand, nine hundred thirteen".