81342041 has 4 divisors (see below), whose sum is σ = 88736784. Its totient is φ = 73947300.

The previous prime is 81342031. The next prime is 81342077. The reversal of 81342041 is 14024318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81342041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81341998 and 81342016.

It is not an unprimeable number, because it can be changed into a prime (81342011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3697355 + ... + 3697376.

It is an arithmetic number, because the mean of its divisors is an integer number (22184196).

Almost surely, 2^81342041 is an apocalyptic number.

It is an amenable number.

81342041 is a deficient number, since it is larger than the sum of its proper divisors (7394743).

81342041 is a wasteful number, since it uses less digits than its factorization.

81342041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7394742.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 81342041 is about 9018.9822596566. The cubic root of 81342041 is about 433.2830386730.

Adding to 81342041 its reverse (14024318), we get a palindrome (95366359).

The spelling of 81342041 in words is "eighty-one million, three hundred forty-two thousand, forty-one".