51234051521 has 4 divisors (see below), whose sum is σ = 51241028544. Its totient is φ = 51227074500.

The previous prime is 51234051493. The next prime is 51234051569. The reversal of 51234051521 is 12515043215.

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 51234051521 - 2⁶ = 51234051457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51234051581) 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, 3477485 + ... + 3492186.

It is an arithmetic number, because the mean of its divisors is an integer number (12810257136).

Almost surely, 2^51234051521 is an apocalyptic number.

It is an amenable number.

51234051521 is a deficient number, since it is larger than the sum of its proper divisors (6977023).

51234051521 is an equidigital number, since it uses as much as digits as its factorization.

51234051521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6977022.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 51234051521 its reverse (12515043215), we get a palindrome (63749094736).

The spelling of 51234051521 in words is "fifty-one billion, two hundred thirty-four million, fifty-one thousand, five hundred twenty-one".