51323131542 has 16 divisors (see below), whose sum is σ = 103454502912. Its totient is φ = 16973003880.

The previous prime is 51323131439. The next prime is 51323131549. The reversal of 51323131542 is 24513132315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51323131549) 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, 33675834 + ... + 33677357.

It is an arithmetic number, because the mean of its divisors is an integer number (6465906432).

Almost surely, 2^51323131542 is an apocalyptic number.

51323131542 is an abundant number, since it is smaller than the sum of its proper divisors (52131371370).

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

51323131542 is a wasteful number, since it uses less digits than its factorization.

51323131542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67353323.

The product of its digits is 10800, while the sum is 30.

Adding to 51323131542 its reverse (24513132315), we get a palindrome (75836263857).

The spelling of 51323131542 in words is "fifty-one billion, three hundred twenty-three million, one hundred thirty-one thousand, five hundred forty-two".