51432531121 has 4 divisors (see below), whose sum is σ = 51484119412. Its totient is φ = 51380942832.

The previous prime is 51432531107. The next prime is 51432531151. The reversal of 51432531121 is 12113523415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30384324721 + 21048206400 = 174311^2 + 145080^2 .

It is a cyclic number.

It is not a de Polignac number, because 51432531121 - 2²⁹ = 50895660209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51432531121.

It is not an unprimeable number, because it can be changed into a prime (51432531151) 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, 25792650 + ... + 25794643.

It is an arithmetic number, because the mean of its divisors is an integer number (12871029853).

Almost surely, 2^51432531121 is an apocalyptic number.

It is an amenable number.

51432531121 is a deficient number, since it is larger than the sum of its proper divisors (51588291).

51432531121 is an equidigital number, since it uses as much as digits as its factorization.

51432531121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51588290.

The product of its digits is 3600, while the sum is 28.

The spelling of 51432531121 in words is "fifty-one billion, four hundred thirty-two million, five hundred thirty-one thousand, one hundred twenty-one".