51968691 has 6 divisors (see below), whose sum is σ = 75065900. Its totient is φ = 34645788.

The previous prime is 51968647. The next prime is 51968701. The reversal of 51968691 is 19686915.

It is not a de Polignac number, because 51968691 - 2⁹ = 51968179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51968611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2887141 + ... + 2887158.

Almost surely, 2^51968691 is an apocalyptic number.

51968691 is a deficient number, since it is larger than the sum of its proper divisors (23097209).

51968691 is a wasteful number, since it uses less digits than its factorization.

51968691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5774305 (or 5774302 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 51968691 is about 7208.9313355032. The cubic root of 51968691 is about 373.1761896218.

The spelling of 51968691 in words is "fifty-one million, nine hundred sixty-eight thousand, six hundred ninety-one".