51250140 has 36 divisors (see below), whose sum is σ = 155459304. Its totient is φ = 13666656.

The previous prime is 51250139. The next prime is 51250151. The reversal of 51250140 is 4105215.

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 a congruent number.

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, 142182 + ... + 142541.

It is an arithmetic number, because the mean of its divisors is an integer number (4318314).

Almost surely, 2^51250140 is an apocalyptic number.

It is an amenable number.

51250140 is an abundant number, since it is smaller than the sum of its proper divisors (104209164).

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

51250140 is a wasteful number, since it uses less digits than its factorization.

51250140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284738 (or 284733 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51250140 is about 7158.9203096556. The cubic root of 51250140 is about 371.4482803010.

Adding to 51250140 its reverse (4105215), we get a palindrome (55355355).

The spelling of 51250140 in words is "fifty-one million, two hundred fifty thousand, one hundred forty".