51550140 has 48 divisors (see below), whose sum is σ = 144658080. Its totient is φ = 13716480.

The previous prime is 51550099. The next prime is 51550159. The reversal of 51550140 is 4105515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45096 + ... + 46224.

It is an arithmetic number, because the mean of its divisors is an integer number (3013710).

Almost surely, 2^51550140 is an apocalyptic number.

It is an amenable number.

51550140 is an abundant number, since it is smaller than the sum of its proper divisors (93107940).

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

51550140 is a wasteful number, since it uses less digits than its factorization.

51550140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902 (or 1900 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51550140 is about 7179.8426166595. The cubic root of 51550140 is about 372.1716458430.

Adding to 51550140 its reverse (4105515), we get a palindrome (55655655).

The spelling of 51550140 in words is "fifty-one million, five hundred fifty thousand, one hundred forty".