51692391 has 16 divisors (see below), whose sum is σ = 76765920. Its totient is φ = 34378560.

The previous prime is 51692383. The next prime is 51692401. The reversal of 51692391 is 19329615.

51692391 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 51692391 - 2³ = 51692383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51692351) 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, 10371 + ... + 14523.

It is an arithmetic number, because the mean of its divisors is an integer number (4797870).

Almost surely, 2^51692391 is an apocalyptic number.

51692391 is a deficient number, since it is larger than the sum of its proper divisors (25073529).

51692391 is a wasteful number, since it uses less digits than its factorization.

51692391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4623 (or 4617 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 51692391 is about 7189.7420676962. The cubic root of 51692391 is about 372.5136634479.

The spelling of 51692391 in words is "fifty-one million, six hundred ninety-two thousand, three hundred ninety-one".