51000135244 has 12 divisors (see below), whose sum is σ = 90507282768. Its totient is φ = 25140911600.

The previous prime is 51000135223. The next prime is 51000135247. The reversal of 51000135244 is 44253100015.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51000135247) 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, 89788687 + ... + 89789254.

It is an arithmetic number, because the mean of its divisors is an integer number (7542273564).

Almost surely, 2^51000135244 is an apocalyptic number.

It is an amenable number.

51000135244 is a deficient number, since it is larger than the sum of its proper divisors (39507147524).

51000135244 is a wasteful number, since it uses less digits than its factorization.

51000135244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179578016 (or 179578014 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 51000135244 its reverse (44253100015), we get a palindrome (95253235259).

The spelling of 51000135244 in words is "fifty-one billion, one hundred thirty-five thousand, two hundred forty-four".