81646883 has 2 divisors, whose sum is σ = 81646884. Its totient is φ = 81646882.

The previous prime is 81646841. The next prime is 81646889. The reversal of 81646883 is 38864618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81646883 - 2⁸ = 81646627 is a prime.

It is not a weakly prime, because it can be changed into another prime (81646889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40823441 + 40823442.

It is an arithmetic number, because the mean of its divisors is an integer number (40823442).

Almost surely, 2^81646883 is an apocalyptic number.

81646883 is a deficient number, since it is larger than the sum of its proper divisors (1).

81646883 is an equidigital number, since it uses as much as digits as its factorization.

81646883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 44.

The square root of 81646883 is about 9035.8664775438. The cubic root of 81646883 is about 433.8236291997.

The spelling of 81646883 in words is "eighty-one million, six hundred forty-six thousand, eight hundred eighty-three".