51504240241 has 4 divisors (see below), whose sum is σ = 52896246772. Its totient is φ = 50112233712.

The previous prime is 51504240233. The next prime is 51504240257. The reversal of 51504240241 is 14204240515.

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 22358921841 + 29145318400 = 149529^2 + 170720^2 .

It is a cyclic number.

It is not a de Polignac number, because 51504240241 - 2³ = 51504240233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51504240211) 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, 696003210 + ... + 696003283.

It is an arithmetic number, because the mean of its divisors is an integer number (13224061693).

Almost surely, 2^51504240241 is an apocalyptic number.

It is an amenable number.

51504240241 is a deficient number, since it is larger than the sum of its proper divisors (1392006531).

51504240241 is a wasteful number, since it uses less digits than its factorization.

51504240241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392006530.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 51504240241 its reverse (14204240515), we get a palindrome (65708480756).

The spelling of 51504240241 in words is "fifty-one billion, five hundred four million, two hundred forty thousand, two hundred forty-one".