51225212761 has 4 divisors (see below), whose sum is σ = 51239991312. Its totient is φ = 51210434212.

The previous prime is 51225212747. The next prime is 51225212783. The reversal of 51225212761 is 16721252215.

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-51225212761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51225212711) 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, 7384075 + ... + 7391008.

It is an arithmetic number, because the mean of its divisors is an integer number (12809997828).

Almost surely, 2^51225212761 is an apocalyptic number.

It is an amenable number.

51225212761 is a deficient number, since it is larger than the sum of its proper divisors (14778551).

51225212761 is a wasteful number, since it uses less digits than its factorization.

51225212761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14778550.

The product of its digits is 16800, while the sum is 34.

Adding to 51225212761 its reverse (16721252215), we get a palindrome (67946464976).

The spelling of 51225212761 in words is "fifty-one billion, two hundred twenty-five million, two hundred twelve thousand, seven hundred sixty-one".