51722217 has 6 divisors (see below), whose sum is σ = 74709882. Its totient is φ = 34481472.

The previous prime is 51722213. The next prime is 51722233. The reversal of 51722217 is 71222715.

It can be written as a sum of positive squares in only one way, i.e., 45846441 + 5875776 = 6771^2 + 2424^2 .

It is not a de Polignac number, because 51722217 - 2² = 51722213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51722213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2873448 + ... + 2873465.

It is an arithmetic number, because the mean of its divisors is an integer number (12451647).

Almost surely, 2^51722217 is an apocalyptic number.

It is an amenable number.

51722217 is a deficient number, since it is larger than the sum of its proper divisors (22987665).

51722217 is a wasteful number, since it uses less digits than its factorization.

51722217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5746919 (or 5746916 counting only the distinct ones).

The product of its digits is 1960, while the sum is 27.

The square root of 51722217 is about 7191.8159737301. The cubic root of 51722217 is about 372.5852952432.

The spelling of 51722217 in words is "fifty-one million, seven hundred twenty-two thousand, two hundred seventeen".