865071253 has 4 divisors (see below), whose sum is σ = 865202220. Its totient is φ = 864940288.

The previous prime is 865071223. The next prime is 865071269. The reversal of 865071253 is 352170568.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 214974244 + 650097009 = 14662^2 + 25497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865071253 is a prime.

It is a super-3 number, since 3×865071253³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865071223) 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 3 ways as a sum of consecutive naturals, for example, 55018 + ... + 68971.

It is an arithmetic number, because the mean of its divisors is an integer number (216300555).

Almost surely, 2^865071253 is an apocalyptic number.

It is an amenable number.

865071253 is a deficient number, since it is larger than the sum of its proper divisors (130967).

865071253 is a wasteful number, since it uses less digits than its factorization.

865071253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130966.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 865071253 is about 29412.0936521017. The cubic root of 865071253 is about 952.8341047495.

The spelling of 865071253 in words is "eight hundred sixty-five million, seventy-one thousand, two hundred fifty-three".