787982021 has 2 divisors, whose sum is σ = 787982022. Its totient is φ = 787982020.

The previous prime is 787981991. The next prime is 787982029. The reversal of 787982021 is 120289787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 787924900 + 57121 = 28070^2 + 239^2 .

It is an emirp because it is prime and its reverse (120289787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 787982021 - 2¹⁴ = 787965637 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 (787982029) 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, 393991010 + 393991011.

It is an arithmetic number, because the mean of its divisors is an integer number (393991011).

Almost surely, 2^787982021 is an apocalyptic number.

It is an amenable number.

787982021 is a deficient number, since it is larger than the sum of its proper divisors (1).

787982021 is an equidigital number, since it uses as much as digits as its factorization.

787982021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 787982021 is about 28071.0174557318. The cubic root of 787982021 is about 923.6457498522.

The spelling of 787982021 in words is "seven hundred eighty-seven million, nine hundred eighty-two thousand, twenty-one".