51021017 has 6 divisors (see below), whose sum is σ = 51903978. Its totient is φ = 50152832.

The previous prime is 51021011. The next prime is 51021037. The reversal of 51021017 is 71012015.

It can be written as a sum of positive squares in only one way, i.e., 50965321 + 55696 = 7139^2 + 236^2 .

It is not a de Polignac number, because 51021017 - 2⁴ = 51021001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51020986 and 51021004.

It is not an unprimeable number, because it can be changed into a prime (51021011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3848 + ... + 10809.

It is an arithmetic number, because the mean of its divisors is an integer number (8650663).

Almost surely, 2^51021017 is an apocalyptic number.

It is an amenable number.

51021017 is a deficient number, since it is larger than the sum of its proper divisors (882961).

51021017 is an equidigital number, since it uses as much as digits as its factorization.

51021017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14775 (or 14716 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 51021017 is about 7142.8997613014. The cubic root of 51021017 is about 370.8939111518.

The spelling of 51021017 in words is "fifty-one million, twenty-one thousand, seventeen".