53531581 has 2 divisors, whose sum is σ = 53531582. Its totient is φ = 53531580.

The previous prime is 53531579. The next prime is 53531629. The reversal of 53531581 is 18513535.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 95481 = 7310^2 + 309^2 .

It is a cyclic number.

It is not a de Polignac number, because 53531581 - 2¹ = 53531579 is a prime.

It is a super-2 number, since 2×53531581² = 5731260328719122, which contains 22 as substring.

Together with 53531579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53531501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26765790 + 26765791.

It is an arithmetic number, because the mean of its divisors is an integer number (26765791).

Almost surely, 2^53531581 is an apocalyptic number.

It is an amenable number.

53531581 is a deficient number, since it is larger than the sum of its proper divisors (1).

53531581 is an equidigital number, since it uses as much as digits as its factorization.

53531581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 31.

The square root of 53531581 is about 7316.5279333848. The cubic root of 53531581 is about 376.8802303489.

The spelling of 53531581 in words is "fifty-three million, five hundred thirty-one thousand, five hundred eighty-one".