51151112521 has 4 divisors (see below), whose sum is σ = 52239434112. Its totient is φ = 50062790932.

The previous prime is 51151112513. The next prime is 51151112527. The reversal of 51151112521 is 12521115115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51151112521 - 2³ = 51151112513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51151112527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544160725 + ... + 544160818.

It is an arithmetic number, because the mean of its divisors is an integer number (13059858528).

Almost surely, 2^51151112521 is an apocalyptic number.

It is an amenable number.

51151112521 is a deficient number, since it is larger than the sum of its proper divisors (1088321591).

51151112521 is a wasteful number, since it uses less digits than its factorization.

51151112521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088321590.

The product of its digits is 500, while the sum is 25.

Adding to 51151112521 its reverse (12521115115), we get a palindrome (63672227636).

The spelling of 51151112521 in words is "fifty-one billion, one hundred fifty-one million, one hundred twelve thousand, five hundred twenty-one".