51995091 has 16 divisors (see below), whose sum is σ = 71767040. Its totient is φ = 33449760.

The previous prime is 51995087. The next prime is 51995123. The reversal of 51995091 is 19059915.

51995091 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 51995091 - 2² = 51995087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51995791) 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, 48105 + ... + 49173.

It is an arithmetic number, because the mean of its divisors is an integer number (4485440).

Almost surely, 2^51995091 is an apocalyptic number.

51995091 is a deficient number, since it is larger than the sum of its proper divisors (19771949).

51995091 is a wasteful number, since it uses less digits than its factorization.

51995091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626.

The product of its (nonzero) digits is 18225, while the sum is 39.

The square root of 51995091 is about 7210.7621649864. The cubic root of 51995091 is about 373.2393698651.

The spelling of 51995091 in words is "fifty-one million, nine hundred ninety-five thousand, ninety-one".