51257217 has 8 divisors (see below), whose sum is σ = 74556000. Its totient is φ = 31064960.

The previous prime is 51257189. The next prime is 51257249. The reversal of 51257217 is 71275215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51257217 - 2¹⁰ = 51256193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51257417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 776592 + ... + 776657.

It is an arithmetic number, because the mean of its divisors is an integer number (9319500).

Almost surely, 2^51257217 is an apocalyptic number.

It is an amenable number.

51257217 is a deficient number, since it is larger than the sum of its proper divisors (23298783).

51257217 is a wasteful number, since it uses less digits than its factorization.

51257217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553263.

The product of its digits is 4900, while the sum is 30.

The square root of 51257217 is about 7159.4145710386. The cubic root of 51257217 is about 371.4653769600.

The spelling of 51257217 in words is "fifty-one million, two hundred fifty-seven thousand, two hundred seventeen".