53503409 has 2 divisors, whose sum is σ = 53503410. Its totient is φ = 53503408.

The previous prime is 53503393. The next prime is 53503421. The reversal of 53503409 is 90430535.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49210225 + 4293184 = 7015^2 + 2072^2 .

It is a cyclic number.

It is not a de Polignac number, because 53503409 - 2⁴ = 53503393 is a prime.

It is a super-2 number, since 2×53503409² = 5725229549242562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (53502409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26751704 + 26751705.

It is an arithmetic number, because the mean of its divisors is an integer number (26751705).

Almost surely, 2^53503409 is an apocalyptic number.

It is an amenable number.

53503409 is a deficient number, since it is larger than the sum of its proper divisors (1).

53503409 is an equidigital number, since it uses as much as digits as its factorization.

53503409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 53503409 is about 7314.6024498943. The cubic root of 53503409 is about 376.8141053143.

The spelling of 53503409 in words is "fifty-three million, five hundred three thousand, four hundred nine".