51320421541 has 4 divisors (see below), whose sum is σ = 51326728992. Its totient is φ = 51314114092.

The previous prime is 51320421511. The next prime is 51320421583. The reversal of 51320421541 is 14512402315.

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 a de Polignac number, because none of the positive numbers 2^k-51320421541 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 (51320421511) 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, 3141505 + ... + 3157798.

It is an arithmetic number, because the mean of its divisors is an integer number (12831682248).

Almost surely, 2^51320421541 is an apocalyptic number.

It is an amenable number.

51320421541 is a deficient number, since it is larger than the sum of its proper divisors (6307451).

51320421541 is an equidigital number, since it uses as much as digits as its factorization.

51320421541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6307450.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 51320421541 its reverse (14512402315), we get a palindrome (65832823856).

The spelling of 51320421541 in words is "fifty-one billion, three hundred twenty million, four hundred twenty-one thousand, five hundred forty-one".