51031155040 has 48 divisors (see below), whose sum is σ = 120589142688. Its totient is φ = 20407714816.

The previous prime is 51031155037. The next prime is 51031155041. The reversal of 51031155040 is 4055113015.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51031154996 and 51031155014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51031155041) 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, 698484 + ... + 768076.

It is an arithmetic number, because the mean of its divisors is an integer number (2512273806).

Almost surely, 2^51031155040 is an apocalyptic number.

It is an amenable number.

51031155040 is an abundant number, since it is smaller than the sum of its proper divisors (69557987648).

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

51031155040 is a wasteful number, since it uses less digits than its factorization.

51031155040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74191 (or 74183 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 51031155040 its reverse (4055113015), we get a palindrome (55086268055).

The spelling of 51031155040 in words is "fifty-one billion, thirty-one million, one hundred fifty-five thousand, forty".