81832413 has 16 divisors (see below), whose sum is σ = 122613120. Its totient is φ = 48168384.

The previous prime is 81832409. The next prime is 81832427. The reversal of 81832413 is 31423818.

It is not a de Polignac number, because 81832413 - 2² = 81832409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81832213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44718 + ... + 46511.

It is an arithmetic number, because the mean of its divisors is an integer number (7663320).

Almost surely, 2^81832413 is an apocalyptic number.

It is an amenable number.

81832413 is a deficient number, since it is larger than the sum of its proper divisors (40780707).

81832413 is a wasteful number, since it uses less digits than its factorization.

81832413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91268.

The product of its digits is 4608, while the sum is 30.

The square root of 81832413 is about 9046.1269613023. The cubic root of 81832413 is about 434.1519798026.

The spelling of 81832413 in words is "eighty-one million, eight hundred thirty-two thousand, four hundred thirteen".