51310140 has 48 divisors (see below), whose sum is σ = 164193792. Its totient is φ = 11727936.

The previous prime is 51310109. The next prime is 51310151. The reversal of 51310140 is 4101315.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 60664 + ... + 61503.

It is an arithmetic number, because the mean of its divisors is an integer number (3420704).

Almost surely, 2^51310140 is an apocalyptic number.

It is an amenable number.

51310140 is an abundant number, since it is smaller than the sum of its proper divisors (112883652).

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

51310140 is a wasteful number, since it uses less digits than its factorization.

51310140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122186 (or 122184 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 51310140 is about 7163.1096599173. The cubic root of 51310140 is about 371.5931788006.

Adding to 51310140 its reverse (4101315), we get a palindrome (55411455).

The spelling of 51310140 in words is "fifty-one million, three hundred ten thousand, one hundred forty".