149561309 has 2 divisors, whose sum is σ = 149561310. Its totient is φ = 149561308.

The previous prime is 149561303. The next prime is 149561327. The reversal of 149561309 is 903165941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129732100 + 19829209 = 11390^2 + 4453^2 .

It is an emirp because it is prime and its reverse (903165941) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149561309 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 (149561303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74780654 + 74780655.

It is an arithmetic number, because the mean of its divisors is an integer number (74780655).

Almost surely, 2^149561309 is an apocalyptic number.

It is an amenable number.

149561309 is a deficient number, since it is larger than the sum of its proper divisors (1).

149561309 is an equidigital number, since it uses as much as digits as its factorization.

149561309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 149561309 is about 12229.5261151036. The cubic root of 149561309 is about 530.8108024209.

The spelling of 149561309 in words is "one hundred forty-nine million, five hundred sixty-one thousand, three hundred nine".