80417521 has 2 divisors, whose sum is σ = 80417522. Its totient is φ = 80417520.

The previous prime is 80417501. The next prime is 80417549. The reversal of 80417521 is 12571408.

It is an a-pointer prime, because the next prime (80417549) can be obtained adding 80417521 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80013025 + 404496 = 8945^2 + 636^2 .

It is a cyclic number.

It is not a de Polignac number, because 80417521 - 2⁵ = 80417489 is a prime.

It is a super-3 number, since 3×80417521³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 80417521.

It is not a weakly prime, because it can be changed into another prime (80417501) 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, 40208760 + 40208761.

It is an arithmetic number, because the mean of its divisors is an integer number (40208761).

Almost surely, 2^80417521 is an apocalyptic number.

It is an amenable number.

80417521 is a deficient number, since it is larger than the sum of its proper divisors (1).

80417521 is an equidigital number, since it uses as much as digits as its factorization.

80417521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 80417521 is about 8967.5816695473. The cubic root of 80417521 is about 431.6352391531.

Adding to 80417521 its reverse (12571408), we get a palindrome (92988929).

The spelling of 80417521 in words is "eighty million, four hundred seventeen thousand, five hundred twenty-one".