1021112989 has 4 divisors (see below), whose sum is σ = 1099660156. Its totient is φ = 942565824.

The previous prime is 1021112987. The next prime is 1021112993. The reversal of 1021112989 is 9892111201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 598193764 + 422919225 = 24458^2 + 20565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021112989 - 2¹ = 1021112987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021112987) 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 in 3 ways as a sum of consecutive naturals, for example, 39273564 + ... + 39273589.

It is an arithmetic number, because the mean of its divisors is an integer number (274915039).

Almost surely, 2^1021112989 is an apocalyptic number.

It is an amenable number.

1021112989 is a deficient number, since it is larger than the sum of its proper divisors (78547167).

1021112989 is an equidigital number, since it uses as much as digits as its factorization.

1021112989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78547166.

The product of its (nonzero) digits is 2592, while the sum is 34.

The square root of 1021112989 is about 31954.8586133627. The cubic root of 1021112989 is about 1006.9887071909.

The spelling of 1021112989 in words is "one billion, twenty-one million, one hundred twelve thousand, nine hundred eighty-nine".