51691092 has 12 divisors (see below), whose sum is σ = 120612576. Its totient is φ = 17230360.

The previous prime is 51691091. The next prime is 51691121. The reversal of 51691092 is 29019615.

51691092 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51691091) 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, 2153784 + ... + 2153807.

It is an arithmetic number, because the mean of its divisors is an integer number (10051048).

Almost surely, 2^51691092 is an apocalyptic number.

It is an amenable number.

51691092 is an abundant number, since it is smaller than the sum of its proper divisors (68921484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51691092 is a wasteful number, since it uses less digits than its factorization.

51691092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307598 (or 4307596 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 51691092 is about 7189.6517300910. The cubic root of 51691092 is about 372.5105430705.

The spelling of 51691092 in words is "fifty-one million, six hundred ninety-one thousand, ninety-two".