51513030250 has 64 divisors (see below), whose sum is σ = 111387249792. Its totient is φ = 17630112000.

The previous prime is 51513030209. The next prime is 51513030259. The reversal of 51513030250 is 5203031515.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (51513030259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 504192 + ... + 597691.

It is an arithmetic number, because the mean of its divisors is an integer number (1740425778).

Almost surely, 2^51513030250 is an apocalyptic number.

51513030250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51513030250 is an abundant number, since it is smaller than the sum of its proper divisors (59874219542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51513030250 is a wasteful number, since it uses less digits than its factorization.

51513030250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101928 (or 1101918 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 25.

Adding to 51513030250 its reverse (5203031515), we get a palindrome (56716061765).

The spelling of 51513030250 in words is "fifty-one billion, five hundred thirteen million, thirty thousand, two hundred fifty".