81308083 has 4 divisors (see below), whose sum is σ = 84111840. Its totient is φ = 78504328.

The previous prime is 81308081. The next prime is 81308089. The reversal of 81308083 is 38080318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81308083 - 2¹ = 81308081 is a prime.

It is a super-2 number, since 2×81308083² = 13222008722269778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81308081) 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, 1401835 + ... + 1401892.

It is an arithmetic number, because the mean of its divisors is an integer number (21027960).

Almost surely, 2^81308083 is an apocalyptic number.

81308083 is a deficient number, since it is larger than the sum of its proper divisors (2803757).

81308083 is a wasteful number, since it uses less digits than its factorization.

81308083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2803756.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 81308083 is about 9017.0994782136. The cubic root of 81308083 is about 433.2227358120. Note that the first 3 decimals are identical.

The spelling of 81308083 in words is "eighty-one million, three hundred eight thousand, eighty-three".