51520441013 has 4 divisors (see below), whose sum is σ = 52718590848. Its totient is φ = 50322291180.

The previous prime is 51520441003. The next prime is 51520441051. The reversal of 51520441013 is 31014402515.

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 51520441013 - 2⁴ = 51520440997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520441003) 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, 599074853 + ... + 599074938.

It is an arithmetic number, because the mean of its divisors is an integer number (13179647712).

Almost surely, 2^51520441013 is an apocalyptic number.

It is an amenable number.

51520441013 is a deficient number, since it is larger than the sum of its proper divisors (1198149835).

51520441013 is a wasteful number, since it uses less digits than its factorization.

51520441013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198149834.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 51520441013 its reverse (31014402515), we get a palindrome (82534843528).

The spelling of 51520441013 in words is "fifty-one billion, five hundred twenty million, four hundred forty-one thousand, thirteen".