865503033131 has 16 divisors (see below), whose sum is σ = 950215553280. Its totient is φ = 781799323680.

The previous prime is 865503033119. The next prime is 865503033139. The reversal of 865503033131 is 131330305568.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 865503033131 - 2¹⁸ = 865502770987 is a prime.

It is a super-2 number, since 2×865503033131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865503033139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4605080 + ... + 4789338.

It is an arithmetic number, because the mean of its divisors is an integer number (59388472080).

Almost surely, 2^865503033131 is an apocalyptic number.

865503033131 is a deficient number, since it is larger than the sum of its proper divisors (84712520149).

865503033131 is a wasteful number, since it uses less digits than its factorization.

865503033131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186994.

The product of its (nonzero) digits is 97200, while the sum is 38.

Adding to 865503033131 its reverse (131330305568), we get a palindrome (996833338699).

The spelling of 865503033131 in words is "eight hundred sixty-five billion, five hundred three million, thirty-three thousand, one hundred thirty-one".