51141439840 has 48 divisors (see below), whose sum is σ = 121428871200. Its totient is φ = 20353766400.

The previous prime is 51141439801. The next prime is 51141439841. The reversal of 51141439840 is 4893414115.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 51141439793 and 51141439802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51141439841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771261 + ... + 834940.

It is an arithmetic number, because the mean of its divisors is an integer number (2529768150).

Almost surely, 2^51141439840 is an apocalyptic number.

It is an amenable number.

51141439840 is an abundant number, since it is smaller than the sum of its proper divisors (70287431360).

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

51141439840 is a wasteful number, since it uses less digits than its factorization.

51141439840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606415 (or 1606407 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 51141439840 in words is "fifty-one billion, one hundred forty-one million, four hundred thirty-nine thousand, eight hundred forty".