821610487 has 2 divisors, whose sum is σ = 821610488. Its totient is φ = 821610486.

The previous prime is 821610473. The next prime is 821610497. The reversal of 821610487 is 784016128.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821610487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821610437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410805243 + 410805244.

It is an arithmetic number, because the mean of its divisors is an integer number (410805244).

Almost surely, 2^821610487 is an apocalyptic number.

821610487 is a deficient number, since it is larger than the sum of its proper divisors (1).

821610487 is an equidigital number, since it uses as much as digits as its factorization.

821610487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 821610487 is about 28663.7486557498. The cubic root of 821610487 is about 936.6025258162.

The spelling of 821610487 in words is "eight hundred twenty-one million, six hundred ten thousand, four hundred eighty-seven".