51851217 has 16 divisors (see below), whose sum is σ = 78022080. Its totient is φ = 30340800.

The previous prime is 51851213. The next prime is 51851221. The reversal of 51851217 is 71215815.

It is an interprime number because it is at equal distance from previous prime (51851213) and next prime (51851221).

It is not a de Polignac number, because 51851217 - 2² = 51851213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51851213) 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, 26134 + ... + 28047.

It is an arithmetic number, because the mean of its divisors is an integer number (4876380).

Almost surely, 2^51851217 is an apocalyptic number.

It is an amenable number.

51851217 is a deficient number, since it is larger than the sum of its proper divisors (26170863).

51851217 is a wasteful number, since it uses less digits than its factorization.

51851217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54224.

The product of its digits is 2800, while the sum is 30.

The square root of 51851217 is about 7200.7789162007. The cubic root of 51851217 is about 372.8947921600.

The spelling of 51851217 in words is "fifty-one million, eight hundred fifty-one thousand, two hundred seventeen".