80821511 has 2 divisors, whose sum is σ = 80821512. Its totient is φ = 80821510.

The previous prime is 80821493. The next prime is 80821547. The reversal of 80821511 is 11512808.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80821511 - 2²² = 76627207 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80821561) 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, 40410755 + 40410756.

It is an arithmetic number, because the mean of its divisors is an integer number (40410756).

Almost surely, 2^80821511 is an apocalyptic number.

80821511 is a deficient number, since it is larger than the sum of its proper divisors (1).

80821511 is an equidigital number, since it uses as much as digits as its factorization.

80821511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 80821511 is about 8990.0784757420. The cubic root of 80821511 is about 432.3568278819.

The spelling of 80821511 in words is "eighty million, eight hundred twenty-one thousand, five hundred eleven".