861875641 has 4 divisors (see below), whose sum is σ = 940227984. Its totient is φ = 783523300.

The previous prime is 861875629. The next prime is 861875657. The reversal of 861875641 is 146578168.

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 861875641 - 2¹³ = 861867449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861875591 and 861875600.

It is not an unprimeable number, because it can be changed into a prime (861875341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39176155 + ... + 39176176.

It is an arithmetic number, because the mean of its divisors is an integer number (235056996).

Almost surely, 2^861875641 is an apocalyptic number.

It is an amenable number.

861875641 is a deficient number, since it is larger than the sum of its proper divisors (78352343).

861875641 is a wasteful number, since it uses less digits than its factorization.

861875641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78352342.

The product of its digits is 322560, while the sum is 46.

The square root of 861875641 is about 29357.7185932422. The cubic root of 861875641 is about 951.6593864359.

The spelling of 861875641 in words is "eight hundred sixty-one million, eight hundred seventy-five thousand, six hundred forty-one".