81342093 has 16 divisors (see below), whose sum is σ = 131241600. Its totient is φ = 43746816.

The previous prime is 81342091. The next prime is 81342119. The reversal of 81342093 is 39024318.

It is not a de Polignac number, because 81342093 - 2¹ = 81342091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81342093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81342091) 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, 113568 + ... + 114281.

It is an arithmetic number, because the mean of its divisors is an integer number (8202600).

Almost surely, 2^81342093 is an apocalyptic number.

It is an amenable number.

81342093 is a deficient number, since it is larger than the sum of its proper divisors (49899507).

81342093 is a wasteful number, since it uses less digits than its factorization.

81342093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227876.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 81342093 is about 9018.9851424648. The cubic root of 81342093 is about 433.2831310021.

The spelling of 81342093 in words is "eighty-one million, three hundred forty-two thousand, ninety-three".