43538531 has 2 divisors, whose sum is σ = 43538532. Its totient is φ = 43538530.

The previous prime is 43538507. The next prime is 43538569. The reversal of 43538531 is 13583534.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43538531 is a prime.

It is a super-2 number, since 2×43538531² = 3791207363275922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43538501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21769265 + 21769266.

It is an arithmetic number, because the mean of its divisors is an integer number (21769266).

Almost surely, 2^43538531 is an apocalyptic number.

43538531 is a deficient number, since it is larger than the sum of its proper divisors (1).

43538531 is an equidigital number, since it uses as much as digits as its factorization.

43538531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 32.

The square root of 43538531 is about 6598.3733601548. The cubic root of 43538531 is about 351.7962917193.

The spelling of 43538531 in words is "forty-three million, five hundred thirty-eight thousand, five hundred thirty-one".