80521687 has 2 divisors, whose sum is σ = 80521688. Its totient is φ = 80521686.

The previous prime is 80521633. The next prime is 80521709. The reversal of 80521687 is 78612508.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80521687 - 2⁷ = 80521559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80521627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40260843 + 40260844.

It is an arithmetic number, because the mean of its divisors is an integer number (40260844).

Almost surely, 2^80521687 is an apocalyptic number.

80521687 is a deficient number, since it is larger than the sum of its proper divisors (1).

80521687 is an equidigital number, since it uses as much as digits as its factorization.

80521687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 80521687 is about 8973.3877103355. The cubic root of 80521687 is about 431.8215265713.

The spelling of 80521687 in words is "eighty million, five hundred twenty-one thousand, six hundred eighty-seven".