51606212 has 36 divisors (see below), whose sum is σ = 105541884. Its totient is φ = 22014720.

The previous prime is 51606211. The next prime is 51606221. The reversal of 51606212 is 21260615.

It can be written as a sum of positive squares in 2 ways, for example, as 16370116 + 35236096 = 4046^2 + 5936^2 .

It is a super-2 number, since 2×51606212² = 5326402233977888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51606211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54608 + ... + 55544.

It is an arithmetic number, because the mean of its divisors is an integer number (2931719).

Almost surely, 2^51606212 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 51606212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52770942).

51606212 is an abundant number, since it is smaller than the sum of its proper divisors (53935672).

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

51606212 is a wasteful number, since it uses less digits than its factorization.

51606212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236 (or 1227 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 51606212 is about 7183.7463763694. The cubic root of 51606212 is about 372.3065361769.

Adding to 51606212 its reverse (21260615), we get a palindrome (72866827).

The spelling of 51606212 in words is "fifty-one million, six hundred six thousand, two hundred twelve".