81830613 has 8 divisors (see below), whose sum is σ = 110422368. Its totient is φ = 53896304.

The previous prime is 81830611. The next prime is 81830633. The reversal of 81830613 is 31603818.

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

It is a cyclic number.

It is not a de Polignac number, because 81830613 - 2¹ = 81830611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81830611) 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, 164070 + ... + 164567.

It is an arithmetic number, because the mean of its divisors is an integer number (13802796).

Almost surely, 2^81830613 is an apocalyptic number.

81830613 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

It is an amenable number.

81830613 is a deficient number, since it is larger than the sum of its proper divisors (28591755).

81830613 is a wasteful number, since it uses less digits than its factorization.

81830613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328723.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 81830613 is about 9046.0274706636. The cubic root of 81830613 is about 434.1487965517.

The spelling of 81830613 in words is "eighty-one million, eight hundred thirty thousand, six hundred thirteen".