51872017 has 2 divisors, whose sum is σ = 51872018. Its totient is φ = 51872016.

The previous prime is 51871999. The next prime is 51872027. The reversal of 51872017 is 71027815.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39488656 + 12383361 = 6284^2 + 3519^2 .

It is a cyclic number.

It is not a de Polignac number, because 51872017 - 2¹¹ = 51869969 is a prime.

It is a super-2 number, since 2×51872017² = 5381412295296578, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51872017.

It is not a weakly prime, because it can be changed into another prime (51872027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25936008 + 25936009.

It is an arithmetic number, because the mean of its divisors is an integer number (25936009).

Almost surely, 2^51872017 is an apocalyptic number.

It is an amenable number.

51872017 is a deficient number, since it is larger than the sum of its proper divisors (1).

51872017 is an equidigital number, since it uses as much as digits as its factorization.

51872017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 51872017 is about 7202.2230595838. The cubic root of 51872017 is about 372.9446474655.

The spelling of 51872017 in words is "fifty-one million, eight hundred seventy-two thousand, seventeen".