81928927 has 2 divisors, whose sum is σ = 81928928. Its totient is φ = 81928926.

The previous prime is 81928919. The next prime is 81928949. The reversal of 81928927 is 72982918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81928927 - 2³ = 81928919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81928997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40964463 + 40964464.

It is an arithmetic number, because the mean of its divisors is an integer number (40964464).

Almost surely, 2^81928927 is an apocalyptic number.

81928927 is a deficient number, since it is larger than the sum of its proper divisors (1).

81928927 is an equidigital number, since it uses as much as digits as its factorization.

81928927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 46.

The square root of 81928927 is about 9051.4599374907. The cubic root of 81928927 is about 434.3225938674.

The spelling of 81928927 in words is "eighty-one million, nine hundred twenty-eight thousand, nine hundred twenty-seven".