81081002 has 8 divisors (see below), whose sum is σ = 121666212. Its totient is φ = 40525600.

The previous prime is 81081001. The next prime is 81081019. The reversal of 81081002 is 20018018.

It can be written as a sum of positive squares in 2 ways, for example, as 81018001 + 63001 = 9001^2 + 251^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81081001) 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 3 ways as a sum of consecutive naturals, for example, 1502 + ... + 12822.

Almost surely, 2^81081002 is an apocalyptic number.

81081002 is a deficient number, since it is larger than the sum of its proper divisors (40585210).

81081002 is a wasteful number, since it uses less digits than its factorization.

81081002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14904.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 81081002 is about 9004.4989866177. The cubic root of 81081002 is about 432.8190515597.

The spelling of 81081002 in words is "eighty-one million, eighty-one thousand, two".