81032123 has 2 divisors, whose sum is σ = 81032124. Its totient is φ = 81032122.

The previous prime is 81032069. The next prime is 81032129. The reversal of 81032123 is 32123018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81032123 - 2¹⁰ = 81031099 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 81032095 and 81032104.

It is not a weakly prime, because it can be changed into another prime (81032129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40516061 + 40516062.

It is an arithmetic number, because the mean of its divisors is an integer number (40516062).

Almost surely, 2^81032123 is an apocalyptic number.

81032123 is a deficient number, since it is larger than the sum of its proper divisors (1).

81032123 is an equidigital number, since it uses as much as digits as its factorization.

81032123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 81032123 is about 9001.7844342108. The cubic root of 81032123 is about 432.7320603019.

The spelling of 81032123 in words is "eighty-one million, thirty-two thousand, one hundred twenty-three".