81000069 has 4 divisors (see below), whose sum is σ = 108000096. Its totient is φ = 54000044.

The previous prime is 81000061. The next prime is 81000071. The reversal of 81000069 is 96000018.

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 81000069 - 2³ = 81000061 is a prime.

It is a super-2 number, since 2×81000069² = 13122022356009522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81000061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13500009 + ... + 13500014.

It is an arithmetic number, because the mean of its divisors is an integer number (27000024).

Almost surely, 2^81000069 is an apocalyptic number.

It is an amenable number.

81000069 is a deficient number, since it is larger than the sum of its proper divisors (27000027).

81000069 is a wasteful number, since it uses less digits than its factorization.

81000069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27000026.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 81000069 is about 9000.0038333325. The cubic root of 81000069 is about 432.6749939505.

The spelling of 81000069 in words is "eighty-one million, sixty-nine", and thus it is an aban number and an uban number.