51543517 has 2 divisors, whose sum is σ = 51543518. Its totient is φ = 51543516.

The previous prime is 51543497. The next prime is 51543533. The reversal of 51543517 is 71534515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51538041 + 5476 = 7179^2 + 74^2 .

It is a cyclic number.

It is not a de Polignac number, because 51543517 - 2¹⁹ = 51019229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51543017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25771758 + 25771759.

It is an arithmetic number, because the mean of its divisors is an integer number (25771759).

Almost surely, 2^51543517 is an apocalyptic number.

It is an amenable number.

51543517 is a deficient number, since it is larger than the sum of its proper divisors (1).

51543517 is an equidigital number, since it uses as much as digits as its factorization.

51543517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10500, while the sum is 31.

The square root of 51543517 is about 7179.3813800355. The cubic root of 51543517 is about 372.1557066792.

The spelling of 51543517 in words is "fifty-one million, five hundred forty-three thousand, five hundred seventeen".