80649641 has 2 divisors, whose sum is σ = 80649642. Its totient is φ = 80649640.

The previous prime is 80649619. The next prime is 80649643. The reversal of 80649641 is 14694608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67897600 + 12752041 = 8240^2 + 3571^2 .

It is a cyclic number.

It is not a de Polignac number, because 80649641 - 2⁶ = 80649577 is a prime.

Together with 80649643, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 80649595 and 80649604.

It is not a weakly prime, because it can be changed into another prime (80649643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40324820 + 40324821.

It is an arithmetic number, because the mean of its divisors is an integer number (40324821).

Almost surely, 2^80649641 is an apocalyptic number.

It is an amenable number.

80649641 is a deficient number, since it is larger than the sum of its proper divisors (1).

80649641 is an equidigital number, since it uses as much as digits as its factorization.

80649641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 80649641 is about 8980.5145175541. The cubic root of 80649641 is about 432.0501359993.

The spelling of 80649641 in words is "eighty million, six hundred forty-nine thousand, six hundred forty-one".