51606891 has 12 divisors (see below), whose sum is σ = 85192432. Its totient is φ = 29489616.

The previous prime is 51606889. The next prime is 51606899. The reversal of 51606891 is 19860615.

It is not a de Polignac number, because 51606891 - 2¹ = 51606889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51606899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 409516 + ... + 409641.

Almost surely, 2^51606891 is an apocalyptic number.

51606891 is a deficient number, since it is larger than the sum of its proper divisors (33585541).

51606891 is a wasteful number, since it uses less digits than its factorization.

51606891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819170 (or 819167 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 51606891 is about 7183.7936356775. The cubic root of 51606891 is about 372.3081690231.

The spelling of 51606891 in words is "fifty-one million, six hundred six thousand, eight hundred ninety-one".