51225577921 has 4 divisors (see below), whose sum is σ = 58543517632. Its totient is φ = 43907638212.

The previous prime is 51225577901. The next prime is 51225577937. The reversal of 51225577921 is 12977552215.

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 51225577921 - 2¹⁵ = 51225545153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51225577901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3658969845 + ... + 3658969858.

It is an arithmetic number, because the mean of its divisors is an integer number (14635879408).

Almost surely, 2^51225577921 is an apocalyptic number.

It is an amenable number.

51225577921 is a deficient number, since it is larger than the sum of its proper divisors (7317939711).

51225577921 is an equidigital number, since it uses as much as digits as its factorization.

51225577921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7317939710.

The product of its digits is 441000, while the sum is 46.

The spelling of 51225577921 in words is "fifty-one billion, two hundred twenty-five million, five hundred seventy-seven thousand, nine hundred twenty-one".