51217152 has 108 divisors (see below), whose sum is σ = 158683896. Its totient is φ = 14622720.

The previous prime is 51217151. The next prime is 51217183. The reversal of 51217152 is 25171215.

It is a super-2 number, since 2×51217152² = 5246393317982208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (51217151) 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, 36952 + ... + 38312.

Almost surely, 2^51217152 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 51217152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79341948).

51217152 is an abundant number, since it is smaller than the sum of its proper divisors (107466744).

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

51217152 is a wasteful number, since it uses less digits than its factorization.

51217152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394 (or 1373 counting only the distinct ones).

The product of its digits is 700, while the sum is 24.

The square root of 51217152 is about 7156.6159600750. The cubic root of 51217152 is about 371.3685669199.

Adding to 51217152 its reverse (25171215), we get a palindrome (76388367).

The spelling of 51217152 in words is "fifty-one million, two hundred seventeen thousand, one hundred fifty-two".