51809000252 has 24 divisors (see below), whose sum is σ = 91016424576. Its totient is φ = 25804473408.

The previous prime is 51809000251. The next prime is 51809000293. The reversal of 51809000252 is 25200090815.

It is a super-2 number, since 2×51809000252² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51809000251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1267478 + ... + 1307714.

It is an arithmetic number, because the mean of its divisors is an integer number (3792351024).

Almost surely, 2^51809000252 is an apocalyptic number.

It is an amenable number.

51809000252 is a deficient number, since it is larger than the sum of its proper divisors (39207424324).

51809000252 is a wasteful number, since it uses less digits than its factorization.

51809000252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41477 (or 41475 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 51809000252 in words is "fifty-one billion, eight hundred nine million, two hundred fifty-two", and thus it is an aban number.