61917845 has 16 divisors (see below), whose sum is σ = 82434240. Its totient is φ = 44265600.

The previous prime is 61917841. The next prime is 61917851. The reversal of 61917845 is 54871916.

61917845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61917845 - 2² = 61917841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61917841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6296 + ... + 12785.

It is an arithmetic number, because the mean of its divisors is an integer number (5152140).

Almost surely, 2^61917845 is an apocalyptic number.

It is an amenable number.

61917845 is a deficient number, since it is larger than the sum of its proper divisors (20516395).

61917845 is a wasteful number, since it uses less digits than its factorization.

61917845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19156.

The product of its digits is 60480, while the sum is 41.

The square root of 61917845 is about 7868.7892969630. The cubic root of 61917845 is about 395.6142661765.

The spelling of 61917845 in words is "sixty-one million, nine hundred seventeen thousand, eight hundred forty-five".