51148140 has 96 divisors (see below), whose sum is σ = 149796864. Its totient is φ = 13025280.

The previous prime is 51148093. The next prime is 51148157. The reversal of 51148140 is 4184115.

51148140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51148140² = 5232264450919200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51148140.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 198892 + ... + 199148.

It is an arithmetic number, because the mean of its divisors is an integer number (1560384).

Almost surely, 2^51148140 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 51148140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74898432).

51148140 is an abundant number, since it is smaller than the sum of its proper divisors (98648724).

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

51148140 is a wasteful number, since it uses less digits than its factorization.

51148140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 51148140 is about 7151.7927822330. The cubic root of 51148140 is about 371.2016930877.

The spelling of 51148140 in words is "fifty-one million, one hundred forty-eight thousand, one hundred forty".