861505249 has 8 divisors (see below), whose sum is σ = 940930848. Its totient is φ = 782264160.

The previous prime is 861505241. The next prime is 861505259. The reversal of 861505249 is 942505168.

861505249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 861505249 - 2³ = 861505241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861505241) 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, 36267 + ... + 55120.

It is an arithmetic number, because the mean of its divisors is an integer number (117616356).

Almost surely, 2^861505249 is an apocalyptic number.

It is an amenable number.

861505249 is a deficient number, since it is larger than the sum of its proper divisors (79425599).

861505249 is a wasteful number, since it uses less digits than its factorization.

861505249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92255.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 861505249 is about 29351.4096595036. The cubic root of 861505249 is about 951.5230413483.

The spelling of 861505249 in words is "eight hundred sixty-one million, five hundred five thousand, two hundred forty-nine".