81143602 has 16 divisors (see below), whose sum is σ = 123927552. Its totient is φ = 39841200.

The previous prime is 81143459. The next prime is 81143611. The reversal of 81143602 is 20634118.

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 7 ways as a sum of consecutive naturals, for example, 24073 + ... + 27235.

It is an arithmetic number, because the mean of its divisors is an integer number (7745472).

Almost surely, 2^81143602 is an apocalyptic number.

81143602 is a deficient number, since it is larger than the sum of its proper divisors (42783950).

81143602 is a wasteful number, since it uses less digits than its factorization.

81143602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3393.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 81143602 is about 9007.9743560914. The cubic root of 81143602 is about 432.9304114016.

The spelling of 81143602 in words is "eighty-one million, one hundred forty-three thousand, six hundred two".