81422943 has 8 divisors (see below), whose sum is σ = 124073088. Its totient is φ = 46527384.

The previous prime is 81422933. The next prime is 81422947. The reversal of 81422943 is 34922418.

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

It is not a de Polignac number, because 81422943 - 2⁹ = 81422431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81422947) 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, 1938621 + ... + 1938662.

It is an arithmetic number, because the mean of its divisors is an integer number (15509136).

Almost surely, 2^81422943 is an apocalyptic number.

81422943 is a deficient number, since it is larger than the sum of its proper divisors (42650145).

81422943 is a wasteful number, since it uses less digits than its factorization.

81422943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877293.

The product of its digits is 13824, while the sum is 33.

The square root of 81422943 is about 9023.4662408633. The cubic root of 81422943 is about 433.4266374365.

The spelling of 81422943 in words is "eighty-one million, four hundred twenty-two thousand, nine hundred forty-three".