921059989 has 2 divisors, whose sum is σ = 921059990. Its totient is φ = 921059988.

The previous prime is 921059977. The next prime is 921060059. The reversal of 921059989 is 989950129.

921059989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 847392100 + 73667889 = 29110^2 + 8583^2 .

It is a cyclic number.

It is not a de Polignac number, because 921059989 - 2⁷ = 921059861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921059969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460529994 + 460529995.

It is an arithmetic number, because the mean of its divisors is an integer number (460529995).

Almost surely, 2^921059989 is an apocalyptic number.

It is an amenable number.

921059989 is a deficient number, since it is larger than the sum of its proper divisors (1).

921059989 is an equidigital number, since it uses as much as digits as its factorization.

921059989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 52.

The square root of 921059989 is about 30348.9701472719. The cubic root of 921059989 is about 972.9622094712.

The spelling of 921059989 in words is "nine hundred twenty-one million, fifty-nine thousand, nine hundred eighty-nine".