861248617 has 4 divisors (see below), whose sum is σ = 865330576. Its totient is φ = 857166660.

The previous prime is 861248581. The next prime is 861248623. The reversal of 861248617 is 716842168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861248617 - 2⁷ = 861248489 is a prime.

It is a super-3 number, since 3×861248617³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861240617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2040663 + ... + 2041084.

It is an arithmetic number, because the mean of its divisors is an integer number (216332644).

Almost surely, 2^861248617 is an apocalyptic number.

It is an amenable number.

861248617 is a deficient number, since it is larger than the sum of its proper divisors (4081959).

861248617 is a wasteful number, since it uses less digits than its factorization.

861248617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081958.

The product of its digits is 129024, while the sum is 43.

The square root of 861248617 is about 29347.0376188126. The cubic root of 861248617 is about 951.4285495609.

The spelling of 861248617 in words is "eight hundred sixty-one million, two hundred forty-eight thousand, six hundred seventeen".