81264135 has 16 divisors (see below), whose sum is σ = 130216320. Its totient is φ = 43276320.

The previous prime is 81264133. The next prime is 81264137. The reversal of 81264135 is 53146218.

It is an interprime number because it is at equal distance from previous prime (81264133) and next prime (81264137).

It is not a de Polignac number, because 81264135 - 2¹ = 81264133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81264133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7420 + ... + 14750.

It is an arithmetic number, because the mean of its divisors is an integer number (8138520).

Almost surely, 2^81264135 is an apocalyptic number.

81264135 is a deficient number, since it is larger than the sum of its proper divisors (48952185).

81264135 is a wasteful number, since it uses less digits than its factorization.

81264135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8078.

The product of its digits is 5760, while the sum is 30.

The square root of 81264135 is about 9014.6622232893. The cubic root of 81264135 is about 433.1446677059.

The spelling of 81264135 in words is "eighty-one million, two hundred sixty-four thousand, one hundred thirty-five".