51224217 has 32 divisors (see below), whose sum is σ = 76515840. Its totient is φ = 30222720.

The previous prime is 51224207. The next prime is 51224221. The reversal of 51224217 is 71242215.

It is not a de Polignac number, because 51224217 - 2⁸ = 51223961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51224207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 314178 + ... + 314340.

It is an arithmetic number, because the mean of its divisors is an integer number (2391120).

Almost surely, 2^51224217 is an apocalyptic number.

It is an amenable number.

51224217 is a deficient number, since it is larger than the sum of its proper divisors (25291623).

51224217 is a wasteful number, since it uses less digits than its factorization.

51224217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373.

The product of its digits is 1120, while the sum is 24.

The square root of 51224217 is about 7157.1095422663. The cubic root of 51224217 is about 371.3856419178.

It can be divided in two parts, 5122 and 4217, that added together give a palindrome (9339).

The spelling of 51224217 in words is "fifty-one million, two hundred twenty-four thousand, two hundred seventeen".