81443023 has 8 divisors (see below), whose sum is σ = 85131648. Its totient is φ = 77766744.

The previous prime is 81443009. The next prime is 81443029. The reversal of 81443023 is 32034418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81443023 - 2¹³ = 81434831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81443029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12036 + ... + 17542.

It is an arithmetic number, because the mean of its divisors is an integer number (10641456).

Almost surely, 2^81443023 is an apocalyptic number.

81443023 is a deficient number, since it is larger than the sum of its proper divisors (3688625).

81443023 is a wasteful number, since it uses less digits than its factorization.

81443023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6173.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 81443023 is about 9024.5788267376. The cubic root of 81443023 is about 433.4622641334.

The spelling of 81443023 in words is "eighty-one million, four hundred forty-three thousand, twenty-three".