80545981 has 2 divisors, whose sum is σ = 80545982. Its totient is φ = 80545980.

The previous prime is 80545957. The next prime is 80545991. The reversal of 80545981 is 18954508.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78943225 + 1602756 = 8885^2 + 1266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80545981 is a prime.

It is a super-2 number, since 2×80545981² = 12975310110504722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80545901) 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, 40272990 + 40272991.

It is an arithmetic number, because the mean of its divisors is an integer number (40272991).

Almost surely, 2^80545981 is an apocalyptic number.

It is an amenable number.

80545981 is a deficient number, since it is larger than the sum of its proper divisors (1).

80545981 is an equidigital number, since it uses as much as digits as its factorization.

80545981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 80545981 is about 8974.7412776080. The cubic root of 80545981 is about 431.8649501411.

The spelling of 80545981 in words is "eighty million, five hundred forty-five thousand, nine hundred eighty-one".