51181040 has 40 divisors (see below), whose sum is σ = 121251168. Its totient is φ = 20084480.

The previous prime is 51181021. The next prime is 51181057. The reversal of 51181040 is 4018115.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent 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, 1796 + ... + 10275.

Almost surely, 2^51181040 is an apocalyptic number.

It is an amenable number.

51181040 is an abundant number, since it is smaller than the sum of its proper divisors (70070128).

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

51181040 is a wasteful number, since it uses less digits than its factorization.

51181040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12137 (or 12131 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 51181040 is about 7154.0925350459. The cubic root of 51181040 is about 371.2812653403.

Adding to 51181040 its reverse (4018115), we get a palindrome (55199155).

The spelling of 51181040 in words is "fifty-one million, one hundred eighty-one thousand, forty".