1021386881 has 2 divisors, whose sum is σ = 1021386882. Its totient is φ = 1021386880.

The previous prime is 1021386871. The next prime is 1021386889. The reversal of 1021386881 is 1886831201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 994771600 + 26615281 = 31540^2 + 5159^2 .

It is an emirp because it is prime and its reverse (1886831201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021386881 - 2²² = 1017192577 is a prime.

It is a super-2 number, since 2×1021386881² = 2086462321357816322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1021386889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510693440 + 510693441.

It is an arithmetic number, because the mean of its divisors is an integer number (510693441).

Almost surely, 2^1021386881 is an apocalyptic number.

It is an amenable number.

1021386881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021386881 is an equidigital number, since it uses as much as digits as its factorization.

1021386881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 1021386881 is about 31959.1439340919. The cubic root of 1021386881 is about 1007.0787336287.

The spelling of 1021386881 in words is "one billion, twenty-one million, three hundred eighty-six thousand, eight hundred eighty-one".