80521559 has 2 divisors, whose sum is σ = 80521560. Its totient is φ = 80521558.

The previous prime is 80521547. The next prime is 80521561. The reversal of 80521559 is 95512508.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80521559 is a prime.

Together with 80521561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80521579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40260779 + 40260780.

It is an arithmetic number, because the mean of its divisors is an integer number (40260780).

Almost surely, 2^80521559 is an apocalyptic number.

80521559 is a deficient number, since it is larger than the sum of its proper divisors (1).

80521559 is an equidigital number, since it uses as much as digits as its factorization.

80521559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 80521559 is about 8973.3805781322. The cubic root of 80521559 is about 431.8212977584.

The spelling of 80521559 in words is "eighty million, five hundred twenty-one thousand, five hundred fifty-nine".