51265517 has 2 divisors, whose sum is σ = 51265518. Its totient is φ = 51265516.

The previous prime is 51265499. The next prime is 51265561. The reversal of 51265517 is 71556215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44970436 + 6295081 = 6706^2 + 2509^2 .

It is a cyclic number.

It is not a de Polignac number, because 51265517 - 2²⁰ = 50216941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51265717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25632758 + 25632759.

It is an arithmetic number, because the mean of its divisors is an integer number (25632759).

Almost surely, 2^51265517 is an apocalyptic number.

It is an amenable number.

51265517 is a deficient number, since it is larger than the sum of its proper divisors (1).

51265517 is an equidigital number, since it uses as much as digits as its factorization.

51265517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10500, while the sum is 32.

The square root of 51265517 is about 7159.9942039083. The cubic root of 51265517 is about 371.4854261446.

The spelling of 51265517 in words is "fifty-one million, two hundred sixty-five thousand, five hundred seventeen".