149989109 has 2 divisors, whose sum is σ = 149989110. Its totient is φ = 149989108.

The previous prime is 149989087. The next prime is 149989121. The reversal of 149989109 is 901989941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149989009 + 100 = 12247^2 + 10^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149989109 is a prime.

It is a super-2 number, since 2×149989109² = 44993465637227762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149989199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74994554 + 74994555.

It is an arithmetic number, because the mean of its divisors is an integer number (74994555).

Almost surely, 2^149989109 is an apocalyptic number.

It is an amenable number.

149989109 is a deficient number, since it is larger than the sum of its proper divisors (1).

149989109 is an equidigital number, since it uses as much as digits as its factorization.

149989109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 50.

The square root of 149989109 is about 12247.0040826318. The cubic root of 149989109 is about 531.3164249306.

The spelling of 149989109 in words is "one hundred forty-nine million, nine hundred eighty-nine thousand, one hundred nine".