81012113 has 16 divisors (see below), whose sum is σ = 100235520. Its totient is φ = 63758016.

The previous prime is 81012101. The next prime is 81012121. The reversal of 81012113 is 31121018.

It is not a de Polignac number, because 81012113 - 2¹² = 81008017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81012091 and 81012100.

It is not an unprimeable number, because it can be changed into a prime (81012163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15668 + ... + 20186.

It is an arithmetic number, because the mean of its divisors is an integer number (6264720).

Almost surely, 2^81012113 is an apocalyptic number.

It is an amenable number.

81012113 is a deficient number, since it is larger than the sum of its proper divisors (19223407).

81012113 is a wasteful number, since it uses less digits than its factorization.

81012113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4736.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 81012113 is about 9000.6729192878. The cubic root of 81012113 is about 432.6964378802.

The spelling of 81012113 in words is "eighty-one million, twelve thousand, one hundred thirteen".