861323089 has 4 divisors (see below), whose sum is σ = 939625200. Its totient is φ = 783020980.

The previous prime is 861323083. The next prime is 861323101. The reversal of 861323089 is 980323168.

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 861323089 - 2²¹ = 859225937 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861323083) 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, 39151039 + ... + 39151060.

It is an arithmetic number, because the mean of its divisors is an integer number (234906300).

Almost surely, 2^861323089 is an apocalyptic number.

It is an amenable number.

861323089 is a deficient number, since it is larger than the sum of its proper divisors (78302111).

861323089 is a wasteful number, since it uses less digits than its factorization.

861323089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78302110.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 861323089 is about 29348.3064076958. The cubic root of 861323089 is about 951.4559720509.

The spelling of 861323089 in words is "eight hundred sixty-one million, three hundred twenty-three thousand, eighty-nine".