81069123 has 16 divisors (see below), whose sum is σ = 115430400. Its totient is φ = 50497440.

The previous prime is 81069103. The next prime is 81069133. The reversal of 81069123 is 32196018.

It is not a de Polignac number, because 81069123 - 2⁵ = 81069091 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 15 ways as a sum of consecutive naturals, for example, 12333 + ... + 17726.

It is an arithmetic number, because the mean of its divisors is an integer number (7214400).

Almost surely, 2^81069123 is an apocalyptic number.

81069123 is a deficient number, since it is larger than the sum of its proper divisors (34361277).

81069123 is a wasteful number, since it uses less digits than its factorization.

81069123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30122.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 81069123 is about 9003.8393477449. The cubic root of 81069123 is about 432.7979134036.

The spelling of 81069123 in words is "eighty-one million, sixty-nine thousand, one hundred twenty-three".