51565312 has 36 divisors (see below), whose sum is σ = 104415696. Its totient is φ = 25410560.

The previous prime is 51565303. The next prime is 51565321. The reversal of 51565312 is 21356515.

It is an interprime number because it is at equal distance from previous prime (51565303) and next prime (51565321).

It is a super-3 number, since 3×51565312³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16758 + ... + 19594.

It is an arithmetic number, because the mean of its divisors is an integer number (2900436).

Almost surely, 2^51565312 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 51565312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52207848).

51565312 is an abundant number, since it is smaller than the sum of its proper divisors (52850384).

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

51565312 is an equidigital number, since it uses as much as digits as its factorization.

51565312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924 (or 2910 counting only the distinct ones).

The product of its digits is 4500, while the sum is 28.

The square root of 51565312 is about 7180.8991080505. The cubic root of 51565312 is about 372.2081542104.

The spelling of 51565312 in words is "fifty-one million, five hundred sixty-five thousand, three hundred twelve".