51140634331521 has 12 divisors (see below), whose sum is σ = 79320167534832. Its totient is φ = 29223219617928.

The previous prime is 51140634331519. The next prime is 51140634331543. The reversal of 51140634331521 is 12513343604115.

It is not a de Polignac number, because 51140634331521 - 2¹ = 51140634331519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51140634331521.

It is not an unprimeable number, because it can be changed into a prime (51140634331021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173947735675 + ... + 173947735968.

It is an arithmetic number, because the mean of its divisors is an integer number (6610013961236).

Almost surely, 2^{51140634331521} is an apocalyptic number.

It is an amenable number.

51140634331521 is a deficient number, since it is larger than the sum of its proper divisors (28179533203311).

51140634331521 is a wasteful number, since it uses less digits than its factorization.

51140634331521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347895471660 (or 347895471653 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

Adding to 51140634331521 its reverse (12513343604115), we get a palindrome (63653977935636).

The spelling of 51140634331521 in words is "fifty-one trillion, one hundred forty billion, six hundred thirty-four million, three hundred thirty-one thousand, five hundred twenty-one".