51223215 has 16 divisors (see below), whose sum is σ = 82130400. Its totient is φ = 27261312.

The previous prime is 51223213. The next prime is 51223217. The reversal of 51223215 is 51232215.

It is an interprime number because it is at equal distance from previous prime (51223213) and next prime (51223217).

It is not a de Polignac number, because 51223215 - 2¹ = 51223213 is a prime.

It is a super-4 number, since 4×51223215⁴ (a number of 32 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51223191 and 51223200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51223213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4281 + ... + 10989.

It is an arithmetic number, because the mean of its divisors is an integer number (5133150).

Almost surely, 2^51223215 is an apocalyptic number.

51223215 is a deficient number, since it is larger than the sum of its proper divisors (30907185).

51223215 is a wasteful number, since it uses less digits than its factorization.

51223215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7226.

The product of its digits is 600, while the sum is 21.

The square root of 51223215 is about 7157.0395415982. The cubic root of 51223215 is about 371.3832203364.

The spelling of 51223215 in words is "fifty-one million, two hundred twenty-three thousand, two hundred fifteen".