53657509 has 2 divisors, whose sum is σ = 53657510. Its totient is φ = 53657508.

The previous prime is 53657467. The next prime is 53657519. The reversal of 53657509 is 90575635.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52852900 + 804609 = 7270^2 + 897^2 .

It is a cyclic number.

It is not a de Polignac number, because 53657509 - 2⁷ = 53657381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53657519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26828754 + 26828755.

It is an arithmetic number, because the mean of its divisors is an integer number (26828755).

Almost surely, 2^53657509 is an apocalyptic number.

It is an amenable number.

53657509 is a deficient number, since it is larger than the sum of its proper divisors (1).

53657509 is an equidigital number, since it uses as much as digits as its factorization.

53657509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141750, while the sum is 40.

The square root of 53657509 is about 7325.1285995537. The cubic root of 53657509 is about 377.1755239958.

The spelling of 53657509 in words is "fifty-three million, six hundred fifty-seven thousand, five hundred nine".