821334487 has 2 divisors, whose sum is σ = 821334488. Its totient is φ = 821334486.

The previous prime is 821334469. The next prime is 821334523. The reversal of 821334487 is 784433128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 821334487 - 2⁷ = 821334359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821334187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410667243 + 410667244.

It is an arithmetic number, because the mean of its divisors is an integer number (410667244).

Almost surely, 2^821334487 is an apocalyptic number.

821334487 is a deficient number, since it is larger than the sum of its proper divisors (1).

821334487 is an equidigital number, since it uses as much as digits as its factorization.

821334487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 40.

The square root of 821334487 is about 28658.9338078024. The cubic root of 821334487 is about 936.4976378137.

The spelling of 821334487 in words is "eight hundred twenty-one million, three hundred thirty-four thousand, four hundred eighty-seven".