80539691 has 2 divisors, whose sum is σ = 80539692. Its totient is φ = 80539690.

The previous prime is 80539681. The next prime is 80539729. The reversal of 80539691 is 19693508.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80539691 is a prime.

It is not a weakly prime, because it can be changed into another prime (80539601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40269845 + 40269846.

It is an arithmetic number, because the mean of its divisors is an integer number (40269846).

Almost surely, 2^80539691 is an apocalyptic number.

80539691 is a deficient number, since it is larger than the sum of its proper divisors (1).

80539691 is an equidigital number, since it uses as much as digits as its factorization.

80539691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 80539691 is about 8974.3908428372. The cubic root of 80539691 is about 431.8537081101.

The spelling of 80539691 in words is "eighty million, five hundred thirty-nine thousand, six hundred ninety-one".