1010989121 has 2 divisors, whose sum is σ = 1010989122. Its totient is φ = 1010989120.

The previous prime is 1010989103. The next prime is 1010989123. The reversal of 1010989121 is 1219890101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 725548096 + 285441025 = 26936^2 + 16895^2 .

It is an emirp because it is prime and its reverse (1219890101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1010989121 - 2¹⁴ = 1010972737 is a prime.

It is a Sophie Germain prime.

Together with 1010989123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1010989123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505494560 + 505494561.

It is an arithmetic number, because the mean of its divisors is an integer number (505494561).

Almost surely, 2^1010989121 is an apocalyptic number.

It is an amenable number.

1010989121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010989121 is an equidigital number, since it uses as much as digits as its factorization.

1010989121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 1010989121 is about 31796.0551169481. The cubic root of 1010989121 is about 1003.6497037905.

The spelling of 1010989121 in words is "one billion, ten million, nine hundred eighty-nine thousand, one hundred twenty-one".