98997989 has 2 divisors, whose sum is σ = 98997990. Its totient is φ = 98997988.

The previous prime is 98997979. The next prime is 98998007. The reversal of 98997989 is 98979989.

98997989 is nontrivially palindromic in base 16.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98704225 + 293764 = 9935^2 + 542^2 .

It is an emirp because it is prime and its reverse (98979989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98997989 - 2¹² = 98993893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98997979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49498994 + 49498995.

It is an arithmetic number, because the mean of its divisors is an integer number (49498995).

Almost surely, 2^98997989 is an apocalyptic number.

It is an amenable number.

98997989 is a deficient number, since it is larger than the sum of its proper divisors (1).

98997989 is an equidigital number, since it uses as much as digits as its factorization.

98997989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26453952, while the sum is 68.

The square root of 98997989 is about 9949.7733140007. The cubic root of 98997989 is about 462.6033685682.

It can be divided in two parts, 9 and 8997989, that multiplied together give a triangular number (80981901 = T₁₂₇₂₆).

The spelling of 98997989 in words is "ninety-eight million, nine hundred ninety-seven thousand, nine hundred eighty-nine".