51029135521 has 12 divisors (see below), whose sum is σ = 63926610132. Its totient is φ = 40374700128.

The previous prime is 51029135519. The next prime is 51029135539. The reversal of 51029135521 is 12553192015.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5003440225 + 46025695296 = 70735^2 + 214536^2 .

It is not a de Polignac number, because 51029135521 - 2¹ = 51029135519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51029135551) 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, 40053630 + ... + 40054903.

It is an arithmetic number, because the mean of its divisors is an integer number (5327217511).

Almost surely, 2^51029135521 is an apocalyptic number.

It is an amenable number.

51029135521 is a deficient number, since it is larger than the sum of its proper divisors (12897474611).

51029135521 is a wasteful number, since it uses less digits than its factorization.

51029135521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80108560 (or 80108553 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 34.

The spelling of 51029135521 in words is "fifty-one billion, twenty-nine million, one hundred thirty-five thousand, five hundred twenty-one".