61845891 has 8 divisors (see below), whose sum is σ = 83692224. Its totient is φ = 40615080.

The previous prime is 61845863. The next prime is 61845913. The reversal of 61845891 is 19854816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61845891 - 2⁹ = 61845379 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (61845841) 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, 153645 + ... + 154046.

It is an arithmetic number, because the mean of its divisors is an integer number (10461528).

Almost surely, 2^61845891 is an apocalyptic number.

61845891 is a deficient number, since it is larger than the sum of its proper divisors (21846333).

61845891 is a wasteful number, since it uses less digits than its factorization.

61845891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307761.

The product of its digits is 69120, while the sum is 42.

The square root of 61845891 is about 7864.2158541078. The cubic root of 61845891 is about 395.4609605464.

The spelling of 61845891 in words is "sixty-one million, eight hundred forty-five thousand, eight hundred ninety-one".