99209989 has 2 divisors, whose sum is σ = 99209990. Its totient is φ = 99209988.

The previous prime is 99209969. The next prime is 99210019. The reversal of 99209989 is 98990299.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87272964 + 11937025 = 9342^2 + 3455^2 .

It is an emirp because it is prime and its reverse (98990299) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99209989 - 2¹³ = 99201797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99209969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49604994 + 49604995.

It is an arithmetic number, because the mean of its divisors is an integer number (49604995).

Almost surely, 2^99209989 is an apocalyptic number.

It is an amenable number.

99209989 is a deficient number, since it is larger than the sum of its proper divisors (1).

99209989 is an equidigital number, since it uses as much as digits as its factorization.

99209989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 944784, while the sum is 55.

The square root of 99209989 is about 9960.4211256352. The cubic root of 99209989 is about 462.9333483071.

The spelling of 99209989 in words is "ninety-nine million, two hundred nine thousand, nine hundred eighty-nine".