80645449 has 2 divisors, whose sum is σ = 80645450. Its totient is φ = 80645448.

The previous prime is 80645447. The next prime is 80645471. The reversal of 80645449 is 94454608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53187849 + 27457600 = 7293^2 + 5240^2 .

It is a cyclic number.

It is not a de Polignac number, because 80645449 - 2¹ = 80645447 is a prime.

Together with 80645447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (80645441) 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, 40322724 + 40322725.

It is an arithmetic number, because the mean of its divisors is an integer number (40322725).

Almost surely, 2^80645449 is an apocalyptic number.

It is an amenable number.

80645449 is a deficient number, since it is larger than the sum of its proper divisors (1).

80645449 is an equidigital number, since it uses as much as digits as its factorization.

80645449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 80645449 is about 8980.2811203213. The cubic root of 80645449 is about 432.0426501816.

The spelling of 80645449 in words is "eighty million, six hundred forty-five thousand, four hundred forty-nine".