81371683 has 8 divisors (see below), whose sum is σ = 84256640. Its totient is φ = 78503040.

The previous prime is 81371671. The next prime is 81371747. The reversal of 81371683 is 38617318.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81371683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81371603) 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, 6553 + ... + 14341.

It is an arithmetic number, because the mean of its divisors is an integer number (10532080).

Almost surely, 2^81371683 is an apocalyptic number.

81371683 is a deficient number, since it is larger than the sum of its proper divisors (2884957).

81371683 is a wasteful number, since it uses less digits than its factorization.

81371683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8157.

The product of its digits is 24192, while the sum is 37.

The square root of 81371683 is about 9020.6254217765. The cubic root of 81371683 is about 433.3356634326.

The spelling of 81371683 in words is "eighty-one million, three hundred seventy-one thousand, six hundred eighty-three".