36231581 has 2 divisors, whose sum is σ = 36231582. Its totient is φ = 36231580.

The previous prime is 36231557. The next prime is 36231583. The reversal of 36231581 is 18513263.

36231581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27994681 + 8236900 = 5291^2 + 2870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36231581 is a prime.

It is a super-2 number, since 2×36231581² = 2625454923519122, which contains 22 as substring.

Together with 36231583, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2217548 and since 36231581 and 2217548 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36231583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18115790 + 18115791.

It is an arithmetic number, because the mean of its divisors is an integer number (18115791).

Almost surely, 2^36231581 is an apocalyptic number.

It is an amenable number.

36231581 is a deficient number, since it is larger than the sum of its proper divisors (1).

36231581 is an equidigital number, since it uses as much as digits as its factorization.

36231581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 36231581 is about 6019.2674803501. The cubic root of 36231581 is about 330.8992339680.

The spelling of 36231581 in words is "thirty-six million, two hundred thirty-one thousand, five hundred eighty-one".