52173509 has 2 divisors, whose sum is σ = 52173510. Its totient is φ = 52173508.

The previous prime is 52173481. The next prime is 52173533. The reversal of 52173509 is 90537125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43890625 + 8282884 = 6625^2 + 2878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52173509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52173559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26086754 + 26086755.

It is an arithmetic number, because the mean of its divisors is an integer number (26086755).

Almost surely, 2^52173509 is an apocalyptic number.

It is an amenable number.

52173509 is a deficient number, since it is larger than the sum of its proper divisors (1).

52173509 is an equidigital number, since it uses as much as digits as its factorization.

52173509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 52173509 is about 7223.1232164487. The cubic root of 52173509 is about 373.6657985656.

The spelling of 52173509 in words is "fifty-two million, one hundred seventy-three thousand, five hundred nine".