51471140 has 24 divisors (see below), whose sum is σ = 123531072. Its totient is φ = 17647200.

The previous prime is 51471139. The next prime is 51471169. The reversal of 51471140 is 4117415.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183686 + ... + 183965.

It is an arithmetic number, because the mean of its divisors is an integer number (5147128).

Almost surely, 2^51471140 is an apocalyptic number.

It is an amenable number.

51471140 is an abundant number, since it is smaller than the sum of its proper divisors (72059932).

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

51471140 is a wasteful number, since it uses less digits than its factorization.

51471140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367667 (or 367665 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 51471140 is about 7174.3389939422. The cubic root of 51471140 is about 371.9814323796.

Adding to 51471140 its reverse (4117415), we get a palindrome (55588555).

The spelling of 51471140 in words is "fifty-one million, four hundred seventy-one thousand, one hundred forty".