81336542 has 8 divisors (see below), whose sum is σ = 139434096. Its totient is φ = 34858512.

The previous prime is 81336539. The next prime is 81336553. The reversal of 81336542 is 24563318.

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

It is a junction number, because it is equal to n+sod(n) for n = 81336499 and 81336508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2904863 + ... + 2904890.

It is an arithmetic number, because the mean of its divisors is an integer number (17429262).

Almost surely, 2^81336542 is an apocalyptic number.

81336542 is a deficient number, since it is larger than the sum of its proper divisors (58097554).

81336542 is a wasteful number, since it uses less digits than its factorization.

81336542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5809762.

The product of its digits is 17280, while the sum is 32.

The square root of 81336542 is about 9018.6773974902. The cubic root of 81336542 is about 433.2732746482.

The spelling of 81336542 in words is "eighty-one million, three hundred thirty-six thousand, five hundred forty-two".