51057217 has 16 divisors (see below), whose sum is σ = 55618560. Its totient is φ = 46728000.

The previous prime is 51057191. The next prime is 51057221. The reversal of 51057217 is 71275015.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51057217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51057247) 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, 71659 + ... + 72367.

It is an arithmetic number, because the mean of its divisors is an integer number (3476160).

Almost surely, 2^51057217 is an apocalyptic number.

It is an amenable number.

51057217 is a deficient number, since it is larger than the sum of its proper divisors (4561343).

51057217 is a wasteful number, since it uses less digits than its factorization.

51057217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 51057217 is about 7145.4332968687. The cubic root of 51057217 is about 370.9816082503.

The spelling of 51057217 in words is "fifty-one million, fifty-seven thousand, two hundred seventeen".