51691267 has 4 divisors (see below), whose sum is σ = 54411880. Its totient is φ = 48970656.

The previous prime is 51691261. The next prime is 51691273. The reversal of 51691267 is 76219615.

51691267 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51691261) and next prime (51691273).

It is a cyclic number.

It is not a de Polignac number, because 51691267 - 2³ = 51691259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51691261) 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 3 ways as a sum of consecutive naturals, for example, 1360278 + ... + 1360315.

It is an arithmetic number, because the mean of its divisors is an integer number (13602970).

Almost surely, 2^51691267 is an apocalyptic number.

51691267 is a deficient number, since it is larger than the sum of its proper divisors (2720613).

51691267 is a wasteful number, since it uses less digits than its factorization.

51691267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720612.

The product of its digits is 22680, while the sum is 37.

The square root of 51691267 is about 7189.6639003503. The cubic root of 51691267 is about 372.5109634477.

The spelling of 51691267 in words is "fifty-one million, six hundred ninety-one thousand, two hundred sixty-seven".