81135446 has 32 divisors (see below), whose sum is σ = 144555840. Its totient is φ = 33417216.

The previous prime is 81135437. The next prime is 81135451. The reversal of 81135446 is 64453118.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 136526 + ... + 137118.

It is an arithmetic number, because the mean of its divisors is an integer number (4517370).

Almost surely, 2^81135446 is an apocalyptic number.

81135446 is a deficient number, since it is larger than the sum of its proper divisors (63420394).

81135446 is a wasteful number, since it uses less digits than its factorization.

81135446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968.

The product of its digits is 11520, while the sum is 32.

The square root of 81135446 is about 9007.5216347228. The cubic root of 81135446 is about 432.9159058474.

The spelling of 81135446 in words is "eighty-one million, one hundred thirty-five thousand, four hundred forty-six".