80781541 has 2 divisors, whose sum is σ = 80781542. Its totient is φ = 80781540.

The previous prime is 80781539. The next prime is 80781551. The reversal of 80781541 is 14518708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60124516 + 20657025 = 7754^2 + 4545^2 .

It is a cyclic number.

It is not a de Polignac number, because 80781541 - 2¹ = 80781539 is a prime.

Together with 80781539, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 80781497 and 80781506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80781511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40390770 + 40390771.

It is an arithmetic number, because the mean of its divisors is an integer number (40390771).

Almost surely, 2^80781541 is an apocalyptic number.

It is an amenable number.

80781541 is a deficient number, since it is larger than the sum of its proper divisors (1).

80781541 is an equidigital number, since it uses as much as digits as its factorization.

80781541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 80781541 is about 8987.8551946502. The cubic root of 80781541 is about 432.2855426024.

The spelling of 80781541 in words is "eighty million, seven hundred eighty-one thousand, five hundred forty-one".