51531031454120 has 128 divisors (see below), whose sum is σ = 128512003645440. Its totient is φ = 18497155522560.

The previous prime is 51531031454087. The next prime is 51531031454131. The reversal of 51531031454120 is 2145413013515.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 367976 + ... + 10158615.

It is an arithmetic number, because the mean of its divisors is an integer number (1004000028480).

Almost surely, 2^{51531031454120} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51531031454120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64256001822720).

51531031454120 is an abundant number, since it is smaller than the sum of its proper divisors (76980972191320).

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

51531031454120 is a wasteful number, since it uses less digits than its factorization.

51531031454120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10526955 (or 10526951 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 51531031454120 its reverse (2145413013515), we get a palindrome (53676444467635).

The spelling of 51531031454120 in words is "fifty-one trillion, five hundred thirty-one billion, thirty-one million, four hundred fifty-four thousand, one hundred twenty".