51533510251 has 4 divisors (see below), whose sum is σ = 51534663472. Its totient is φ = 51532357032.

The previous prime is 51533510239. The next prime is 51533510297. The reversal of 51533510251 is 15201533515.

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 51533510251 - 2⁹ = 51533509739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51533510051) 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, 506760 + ... + 599893.

It is an arithmetic number, because the mean of its divisors is an integer number (12883665868).

Almost surely, 2^51533510251 is an apocalyptic number.

51533510251 is a deficient number, since it is larger than the sum of its proper divisors (1153221).

51533510251 is a wasteful number, since it uses less digits than its factorization.

51533510251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153220.

The product of its (nonzero) digits is 11250, while the sum is 31.

The spelling of 51533510251 in words is "fifty-one billion, five hundred thirty-three million, five hundred ten thousand, two hundred fifty-one".