51163140 has 96 divisors (see below), whose sum is σ = 166489344. Its totient is φ = 11496960.

The previous prime is 51163139. The next prime is 51163169. The reversal of 51163140 is 4136115.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24622 + ... + 26618.

It is an arithmetic number, because the mean of its divisors is an integer number (1734264).

Almost surely, 2^51163140 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 51163140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83244672).

51163140 is an abundant number, since it is smaller than the sum of its proper divisors (115326204).

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

51163140 is a wasteful number, since it uses less digits than its factorization.

51163140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077 (or 2075 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 51163140 is about 7152.8413934604. The cubic root of 51163140 is about 371.2379764610.

Adding to 51163140 its reverse (4136115), we get a palindrome (55299255).

It can be divided in two parts, 5116 and 3140, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 51163140 in words is "fifty-one million, one hundred sixty-three thousand, one hundred forty".