99942289 has 2 divisors, whose sum is σ = 99942290. Its totient is φ = 99942288.

The previous prime is 99942281. The next prime is 99942317. The reversal of 99942289 is 98224999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99700225 + 242064 = 9985^2 + 492^2 .

It is an emirp because it is prime and its reverse (98224999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99942289 - 2³ = 99942281 is a prime.

It is a super-2 number, since 2×99942289² = 19976922261119042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99942281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49971144 + 49971145.

It is an arithmetic number, because the mean of its divisors is an integer number (49971145).

Almost surely, 2^99942289 is an apocalyptic number.

It is an amenable number.

99942289 is a deficient number, since it is larger than the sum of its proper divisors (1).

99942289 is an equidigital number, since it uses as much as digits as its factorization.

99942289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 52.

The square root of 99942289 is about 9997.1140335599. The cubic root of 99942289 is about 464.0695759346.

The spelling of 99942289 in words is "ninety-nine million, nine hundred forty-two thousand, two hundred eighty-nine".