81061402 has 8 divisors (see below), whose sum is σ = 121641012. Its totient is φ = 40514400.

The previous prime is 81061397. The next prime is 81061427. The reversal of 81061402 is 20416018.

It can be written as a sum of positive squares in 2 ways, for example, as 51998521 + 29062881 = 7211^2 + 5391^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 499 + ... + 12742.

Almost surely, 2^81061402 is an apocalyptic number.

81061402 is a deficient number, since it is larger than the sum of its proper divisors (40579610).

81061402 is a wasteful number, since it uses less digits than its factorization.

81061402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16304.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 81061402 is about 9003.4105759984. The cubic root of 81061402 is about 432.7841731177.

The spelling of 81061402 in words is "eighty-one million, sixty-one thousand, four hundred two".