51052005251 has 4 divisors (see below), whose sum is σ = 54979082592. Its totient is φ = 47124927912.

The previous prime is 51052005247. The next prime is 51052005271. The reversal of 51052005251 is 15250025015.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51052005251 - 2² = 51052005247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51052005251.

It is not an unprimeable number, because it can be changed into a prime (51052005271) 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, 1963538651 + ... + 1963538676.

It is an arithmetic number, because the mean of its divisors is an integer number (13744770648).

Almost surely, 2^51052005251 is an apocalyptic number.

51052005251 is a deficient number, since it is larger than the sum of its proper divisors (3927077341).

51052005251 is a wasteful number, since it uses less digits than its factorization.

51052005251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927077340.

The product of its (nonzero) digits is 2500, while the sum is 26.

The spelling of 51052005251 in words is "fifty-one billion, fifty-two million, five thousand, two hundred fifty-one".