81508683 has 8 divisors (see below), whose sum is σ = 108881296. Its totient is φ = 54237600.

The previous prime is 81508633. The next prime is 81508699. The reversal of 81508683 is 38680518.

It is a happy number.

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

It is not a de Polignac number, because 81508683 - 2¹⁰ = 81507659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81508633) 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, 23488 + ... + 26733.

It is an arithmetic number, because the mean of its divisors is an integer number (13610162).

Almost surely, 2^81508683 is an apocalyptic number.

81508683 is a deficient number, since it is larger than the sum of its proper divisors (27372613).

81508683 is a wasteful number, since it uses less digits than its factorization.

81508683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50765.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 81508683 is about 9028.2159367175. The cubic root of 81508683 is about 433.5787197286.

The spelling of 81508683 in words is "eighty-one million, five hundred eight thousand, six hundred eighty-three".