989919121 has 2 divisors, whose sum is σ = 989919122. Its totient is φ = 989919120.

The previous prime is 989919101. The next prime is 989919137. The reversal of 989919121 is 121919989.

989919121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 572166400 + 417752721 = 23920^2 + 20439^2 .

It is a cyclic number.

It is not a de Polignac number, because 989919121 - 2¹¹ = 989917073 is a prime.

It is a super-2 number, since 2×989919121² = 1959879732242825282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (989919101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494959560 + 494959561.

It is an arithmetic number, because the mean of its divisors is an integer number (494959561).

Almost surely, 2^989919121 is an apocalyptic number.

It is an amenable number.

989919121 is a deficient number, since it is larger than the sum of its proper divisors (1).

989919121 is an equidigital number, since it uses as much as digits as its factorization.

989919121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 49.

The square root of 989919121 is about 31462.9801671742. The cubic root of 989919121 is about 996.6283517645.

The spelling of 989919121 in words is "nine hundred eighty-nine million, nine hundred nineteen thousand, one hundred twenty-one".