53181509 has 2 divisors, whose sum is σ = 53181510. Its totient is φ = 53181508.

The previous prime is 53181473. The next prime is 53181533. The reversal of 53181509 is 90518135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46881409 + 6300100 = 6847^2 + 2510^2 .

It is a cyclic number.

It is not a de Polignac number, because 53181509 - 2¹² = 53177413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53181599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26590754 + 26590755.

It is an arithmetic number, because the mean of its divisors is an integer number (26590755).

Almost surely, 2^53181509 is an apocalyptic number.

It is an amenable number.

53181509 is a deficient number, since it is larger than the sum of its proper divisors (1).

53181509 is an equidigital number, since it uses as much as digits as its factorization.

53181509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 53181509 is about 7292.5653236704. The cubic root of 53181509 is about 376.0568916668.

The spelling of 53181509 in words is "fifty-three million, one hundred eighty-one thousand, five hundred nine".