51291012 has 48 divisors (see below), whose sum is σ = 126443520. Its totient is φ = 16149408.

The previous prime is 51291011. The next prime is 51291017. The reversal of 51291012 is 21019215.

It is a self number, because there is not a number n which added to its sum of digits gives 51291012.

It is not an unprimeable number, because it can be changed into a prime (51291011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21789 + ... + 24027.

It is an arithmetic number, because the mean of its divisors is an integer number (2634240).

Almost surely, 2^51291012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51291012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63221760).

51291012 is an abundant number, since it is smaller than the sum of its proper divisors (75152508).

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

51291012 is a wasteful number, since it uses less digits than its factorization.

51291012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352 (or 2350 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 51291012 is about 7161.7743611482. The cubic root of 51291012 is about 371.5469974301.

The spelling of 51291012 in words is "fifty-one million, two hundred ninety-one thousand, twelve".