51031780 has 24 divisors (see below), whose sum is σ = 107308152. Its totient is φ = 20385792.

The previous prime is 51031763. The next prime is 51031787. The reversal of 51031780 is 8713015.

51031780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 27625536 + 23406244 = 5256^2 + 4838^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51031787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21954 + ... + 24166.

It is an arithmetic number, because the mean of its divisors is an integer number (4471173).

Almost surely, 2^51031780 is an apocalyptic number.

It is an amenable number.

51031780 is an abundant number, since it is smaller than the sum of its proper divisors (56276372).

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

51031780 is a wasteful number, since it uses less digits than its factorization.

51031780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3375 (or 3373 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 51031780 is about 7143.6531270772. The cubic root of 51031780 is about 370.9199896239.

Adding to 51031780 its reverse (8713015), we get a palindrome (59744795).

The spelling of 51031780 in words is "fifty-one million, thirty-one thousand, seven hundred eighty".