51189992 has 48 divisors (see below), whose sum is σ = 116561760. Its totient is φ = 20641536.

The previous prime is 51189949. The next prime is 51190063. The reversal of 51189992 is 29998115.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14603 + ... + 17765.

It is an arithmetic number, because the mean of its divisors is an integer number (2428370).

Almost surely, 2^51189992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51189992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58280880).

51189992 is an abundant number, since it is smaller than the sum of its proper divisors (65371768).

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

51189992 is a wasteful number, since it uses less digits than its factorization.

51189992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210 (or 3189 counting only the distinct ones).

The product of its digits is 58320, while the sum is 44.

The square root of 51189992 is about 7154.7181635617. The cubic root of 51189992 is about 371.3029108306.

The spelling of 51189992 in words is "fifty-one million, one hundred eighty-nine thousand, nine hundred ninety-two".