861540241 has 4 divisors (see below), whose sum is σ = 862706800. Its totient is φ = 860373684.

The previous prime is 861540223. The next prime is 861540247. The reversal of 861540241 is 142045168.

861540241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 861540241 - 2⁹ = 861539729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861540247) 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, 582171 + ... + 583648.

It is an arithmetic number, because the mean of its divisors is an integer number (215676700).

Almost surely, 2^861540241 is an apocalyptic number.

It is an amenable number.

861540241 is a deficient number, since it is larger than the sum of its proper divisors (1166559).

861540241 is a wasteful number, since it uses less digits than its factorization.

861540241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166558.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 861540241 is about 29352.0057406645. The cubic root of 861540241 is about 951.5359239332.

The spelling of 861540241 in words is "eight hundred sixty-one million, five hundred forty thousand, two hundred forty-one".