51151140 has 36 divisors (see below), whose sum is σ = 155159004. Its totient is φ = 13640256.

The previous prime is 51151129. The next prime is 51151153. The reversal of 51151140 is 4115115.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18455616 + 32695524 = 4296^2 + 5718^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141907 + ... + 142266.

Almost surely, 2^51151140 is an apocalyptic number.

It is an amenable number.

51151140 is an abundant number, since it is smaller than the sum of its proper divisors (104007864).

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

51151140 is a wasteful number, since it uses less digits than its factorization.

51151140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284188 (or 284183 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 51151140 is about 7152.0025167781. The cubic root of 51151140 is about 371.2089503298.

Adding to 51151140 its reverse (4115115), we get a palindrome (55266255).

The spelling of 51151140 in words is "fifty-one million, one hundred fifty-one thousand, one hundred forty".