80787521 has 2 divisors, whose sum is σ = 80787522. Its totient is φ = 80787520.

The previous prime is 80787503. The next prime is 80787571. The reversal of 80787521 is 12578708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72863296 + 7924225 = 8536^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 80787521 - 2¹⁸ = 80525377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80787571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40393760 + 40393761.

It is an arithmetic number, because the mean of its divisors is an integer number (40393761).

Almost surely, 2^80787521 is an apocalyptic number.

It is an amenable number.

80787521 is a deficient number, since it is larger than the sum of its proper divisors (1).

80787521 is an equidigital number, since it uses as much as digits as its factorization.

80787521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 80787521 is about 8988.1878596300. The cubic root of 80787521 is about 432.2962092462.

The spelling of 80787521 in words is "eighty million, seven hundred eighty-seven thousand, five hundred twenty-one".