51212310 has 64 divisors (see below), whose sum is σ = 129392640. Its totient is φ = 12954240.

The previous prime is 51212309. The next prime is 51212311. The reversal of 51212310 is 1321215.

It is an interprime number because it is at equal distance from previous prime (51212309) and next prime (51212311).

It is a super-2 number, since 2×51212310² = 5245401391072200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 51212310.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51212311) 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 31 ways as a sum of consecutive naturals, for example, 48771 + ... + 49809.

It is an arithmetic number, because the mean of its divisors is an integer number (2021760).

Almost surely, 2^51212310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51212310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64696320).

51212310 is an abundant number, since it is smaller than the sum of its proper divisors (78180330).

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

51212310 is a wasteful number, since it uses less digits than its factorization.

51212310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 51212310 is about 7156.2776637020. The cubic root of 51212310 is about 371.3568636577.

Adding to 51212310 its reverse (1321215), we get a palindrome (52533525).

The spelling of 51212310 in words is "fifty-one million, two hundred twelve thousand, three hundred ten".