81069105 has 32 divisors (see below), whose sum is σ = 147047040. Its totient is φ = 37808640.

The previous prime is 81069103. The next prime is 81069133. The reversal of 81069105 is 50196018.

It is a happy number.

It is not a de Polignac number, because 81069105 - 2¹ = 81069103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81069103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7236 + ... + 14645.

It is an arithmetic number, because the mean of its divisors is an integer number (4595220).

Almost surely, 2^81069105 is an apocalyptic number.

It is an amenable number.

81069105 is a deficient number, since it is larger than the sum of its proper divisors (65977935).

81069105 is a wasteful number, since it uses less digits than its factorization.

81069105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21921.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 81069105 is about 9003.8383481713. The cubic root of 81069105 is about 432.7978813719.

The spelling of 81069105 in words is "eighty-one million, sixty-nine thousand, one hundred five".