81830969 has 6 divisors (see below), whose sum is σ = 89946570. Its totient is φ = 74391680.

The previous prime is 81830927. The next prime is 81831017. The reversal of 81830969 is 96903818.

It can be written as a sum of positive squares in only one way, i.e., 41126569 + 40704400 = 6413^2 + 6380^2 .

It is not a de Polignac number, because 81830969 - 2¹⁶ = 81765433 is a prime.

It is a super-2 number, since 2×81830969² = 13392614974957922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81830369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 338024 + ... + 338265.

It is an arithmetic number, because the mean of its divisors is an integer number (14991095).

Almost surely, 2^81830969 is an apocalyptic number.

It is an amenable number.

81830969 is a deficient number, since it is larger than the sum of its proper divisors (8115601).

81830969 is a wasteful number, since it uses less digits than its factorization.

81830969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676311 (or 676300 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 81830969 is about 9046.0471477878. The cubic root of 81830969 is about 434.1494261317.

The spelling of 81830969 in words is "eighty-one million, eight hundred thirty thousand, nine hundred sixty-nine".