81036189 has 24 divisors (see below), whose sum is σ = 126427392. Its totient is φ = 49721760.

The previous prime is 81036187. The next prime is 81036203. The reversal of 81036189 is 98163018.

It is not a de Polignac number, because 81036189 - 2¹ = 81036187 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81036181) 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 in 23 ways as a sum of consecutive naturals, for example, 49624 + ... + 51230.

It is an arithmetic number, because the mean of its divisors is an integer number (5267808).

Almost surely, 2^81036189 is an apocalyptic number.

It is an amenable number.

81036189 is a deficient number, since it is larger than the sum of its proper divisors (45391203).

81036189 is a wasteful number, since it uses less digits than its factorization.

81036189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057 (or 2054 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 81036189 is about 9002.0102754885. The cubic root of 81036189 is about 432.7392980041.

It can be divided in two parts, 81036 and 189, that added together give a square (81225 = 285²).

The spelling of 81036189 in words is "eighty-one million, thirty-six thousand, one hundred eighty-nine".