81010869 has 4 divisors (see below), whose sum is σ = 108014496. Its totient is φ = 54007244.

The previous prime is 81010861. The next prime is 81010873. The reversal of 81010869 is 96801018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81010869 - 2³ = 81010861 is a prime.

It is a super-2 number, since 2×81010869² = 13125521792270322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81010861) 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 3 ways as a sum of consecutive naturals, for example, 13501809 + ... + 13501814.

It is an arithmetic number, because the mean of its divisors is an integer number (27003624).

Almost surely, 2^81010869 is an apocalyptic number.

It is an amenable number.

81010869 is a deficient number, since it is larger than the sum of its proper divisors (27003627).

81010869 is a wasteful number, since it uses less digits than its factorization.

81010869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27003626.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 81010869 is about 9000.6038130783. The cubic root of 81010869 is about 432.6942230792.

The spelling of 81010869 in words is "eighty-one million, ten thousand, eight hundred sixty-nine".