865195131 has 8 divisors (see below), whose sum is σ = 1180421440. Its totient is φ = 563382792.

The previous prime is 865195109. The next prime is 865195139. The reversal of 865195131 is 131591568.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 865195131 - 2⁹ = 865194619 is a prime.

It is a super-2 number, since 2×865195131² = 1497125229412214322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 865195131.

It is not an unprimeable number, because it can be changed into a prime (865195139) 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 in 7 ways as a sum of consecutive naturals, for example, 3353341 + ... + 3353598.

It is an arithmetic number, because the mean of its divisors is an integer number (147552680).

Almost surely, 2^865195131 is an apocalyptic number.

865195131 is a deficient number, since it is larger than the sum of its proper divisors (315226309).

865195131 is a wasteful number, since it uses less digits than its factorization.

865195131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6706985.

The product of its digits is 32400, while the sum is 39.

The square root of 865195131 is about 29414.1994791631. The cubic root of 865195131 is about 952.8795844519.

The spelling of 865195131 in words is "eight hundred sixty-five million, one hundred ninety-five thousand, one hundred thirty-one".