861604459 has 8 divisors (see below), whose sum is σ = 905471600. Its totient is φ = 818820576.

The previous prime is 861604453. The next prime is 861604477. The reversal of 861604459 is 954406168.

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

It is a cyclic number.

It is not a de Polignac number, because 861604459 - 2¹¹ = 861602411 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861604453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269184 + ... + 272365.

It is an arithmetic number, because the mean of its divisors is an integer number (113183950).

Almost surely, 2^861604459 is an apocalyptic number.

861604459 is a deficient number, since it is larger than the sum of its proper divisors (43867141).

861604459 is a wasteful number, since it uses less digits than its factorization.

861604459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541629.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 861604459 is about 29353.0996489298. The cubic root of 861604459 is about 951.5595653964.

The spelling of 861604459 in words is "eight hundred sixty-one million, six hundred four thousand, four hundred fifty-nine".