43513020581 has 2 divisors, whose sum is σ = 43513020582. Its totient is φ = 43513020580.

The previous prime is 43513020553. The next prime is 43513020583. The reversal of 43513020581 is 18502031534.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25646421025 + 17866599556 = 160145^2 + 133666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43513020581 is a prime.

It is a super-2 number, since 2×43513020581² (a number of 22 digits) contains 22 as substring.

Together with 43513020583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43513020583) 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, 21756510290 + 21756510291.

It is an arithmetic number, because the mean of its divisors is an integer number (21756510291).

Almost surely, 2^43513020581 is an apocalyptic number.

It is an amenable number.

43513020581 is a deficient number, since it is larger than the sum of its proper divisors (1).

43513020581 is an equidigital number, since it uses as much as digits as its factorization.

43513020581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 43513020581 in words is "forty-three billion, five hundred thirteen million, twenty thousand, five hundred eighty-one".