51010812 has 54 divisors (see below), whose sum is σ = 137003048. Its totient is φ = 16000128.

The previous prime is 51010811. The next prime is 51010831. The reversal of 51010812 is 21801015.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51010811) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7953 + ... + 12855.

Almost surely, 2^51010812 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 51010812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68501524).

51010812 is an abundant number, since it is smaller than the sum of its proper divisors (85992236).

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

51010812 is a wasteful number, since it uses less digits than its factorization.

51010812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4947 (or 4925 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 51010812 is about 7142.1853798400. The cubic root of 51010812 is about 370.8691813120.

Adding to 51010812 its reverse (21801015), we get a palindrome (72811827).

The spelling of 51010812 in words is "fifty-one million, ten thousand, eight hundred twelve".