861680541 has 8 divisors (see below), whose sum is σ = 1149135840. Its totient is φ = 574339472.

The previous prime is 861680537. The next prime is 861680587. The reversal of 861680541 is 145086168.

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 861680541 - 2² = 861680537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861680541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861684541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9051 + ... + 42488.

It is an arithmetic number, because the mean of its divisors is an integer number (143641980).

Almost surely, 2^861680541 is an apocalyptic number.

It is an amenable number.

861680541 is a deficient number, since it is larger than the sum of its proper divisors (287455299).

861680541 is a wasteful number, since it uses less digits than its factorization.

861680541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57115.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 861680541 is about 29354.3955992965. The cubic root of 861680541 is about 951.5875729983.

The spelling of 861680541 in words is "eight hundred sixty-one million, six hundred eighty thousand, five hundred forty-one".