81023 has 2 divisors, whose sum is σ = 81024. Its totient is φ = 81022.

The previous prime is 81019. The next prime is 81031. The reversal of 81023 is 32018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81023 - 2² = 81019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80989 and 81007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40511 + 40512.

It is an arithmetic number, because the mean of its divisors is an integer number (40512).

2⁸¹⁰²³ is an apocalyptic number.

81023 is a deficient number, since it is larger than the sum of its proper divisors (1).

81023 is an equidigital number, since it uses as much as digits as its factorization.

81023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 81023 is about 284.6453934284. The cubic root of 81023 is about 43.2715819982.

The spelling of 81023 in words is "eighty-one thousand, twenty-three".