821416087 has 2 divisors, whose sum is σ = 821416088. Its totient is φ = 821416086.

The previous prime is 821416067. The next prime is 821416093. The reversal of 821416087 is 780614128.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821416087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821416067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410708043 + 410708044.

It is an arithmetic number, because the mean of its divisors is an integer number (410708044).

Almost surely, 2^821416087 is an apocalyptic number.

821416087 is a deficient number, since it is larger than the sum of its proper divisors (1).

821416087 is an equidigital number, since it uses as much as digits as its factorization.

821416087 is an evil number, because the sum of its binary digits is even.

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

The square root of 821416087 is about 28660.3574122864. The cubic root of 821416087 is about 936.5286506259.

The spelling of 821416087 in words is "eight hundred twenty-one million, four hundred sixteen thousand, eighty-seven".