861561254 has 8 divisors (see below), whose sum is σ = 1293596040. Its totient is φ = 430362576.

The previous prime is 861561229. The next prime is 861561271. The reversal of 861561254 is 452165168.

It is a happy number.

861561254 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 Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206444 + ... + 210575.

It is an arithmetic number, because the mean of its divisors is an integer number (161699505).

Almost surely, 2^861561254 is an apocalyptic number.

861561254 is a deficient number, since it is larger than the sum of its proper divisors (432034786).

861561254 is a wasteful number, since it uses less digits than its factorization.

861561254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418054.

The product of its digits is 57600, while the sum is 38.

The square root of 861561254 is about 29352.3636867629. The cubic root of 861561254 is about 951.5436598697.

The spelling of 861561254 in words is "eight hundred sixty-one million, five hundred sixty-one thousand, two hundred fifty-four".