861017389 has 4 divisors (see below), whose sum is σ = 861584256. Its totient is φ = 860450524.

The previous prime is 861017371. The next prime is 861017413. The reversal of 861017389 is 983710168.

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 861017389 - 2¹⁷ = 860886317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861017789) 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, 281149 + ... + 284194.

It is an arithmetic number, because the mean of its divisors is an integer number (215396064).

Almost surely, 2^861017389 is an apocalyptic number.

It is an amenable number.

861017389 is a deficient number, since it is larger than the sum of its proper divisors (566867).

861017389 is a wasteful number, since it uses less digits than its factorization.

861017389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566866.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 861017389 is about 29343.0978085137. The cubic root of 861017389 is about 951.3433954380.

The spelling of 861017389 in words is "eight hundred sixty-one million, seventeen thousand, three hundred eighty-nine".