51215283 has 24 divisors (see below), whose sum is σ = 84734208. Its totient is φ = 29200752.

The previous prime is 51215249. The next prime is 51215287. The reversal of 51215283 is 38251215.

It is a happy number.

It is not a de Polignac number, because 51215283 - 2¹⁰ = 51214259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51215287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51610 + ... + 52592.

It is an arithmetic number, because the mean of its divisors is an integer number (3530592).

Almost surely, 2^51215283 is an apocalyptic number.

51215283 is a deficient number, since it is larger than the sum of its proper divisors (33518925).

51215283 is a wasteful number, since it uses less digits than its factorization.

51215283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823 (or 1820 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 51215283 is about 7156.4853804085. The cubic root of 51215283 is about 371.3640495771.

Adding to 51215283 its reverse (38251215), we get a palindrome (89466498).

It can be divided in two parts, 5121 and 5283, that added together give a square (10404 = 102²).

The spelling of 51215283 in words is "fifty-one million, two hundred fifteen thousand, two hundred eighty-three".