149787809 has 2 divisors, whose sum is σ = 149787810. Its totient is φ = 149787808.

The previous prime is 149787797. The next prime is 149787821. The reversal of 149787809 is 908787941.

It is a balanced prime because it is at equal distance from previous prime (149787797) and next prime (149787821).

It can be written as a sum of positive squares in only one way, i.e., 104857600 + 44930209 = 10240^2 + 6703^2 .

It is an emirp because it is prime and its reverse (908787941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149787809 - 2⁴ = 149787793 is a prime.

It is not a weakly prime, because it can be changed into another prime (149787899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74893904 + 74893905.

It is an arithmetic number, because the mean of its divisors is an integer number (74893905).

Almost surely, 2^149787809 is an apocalyptic number.

It is an amenable number.

149787809 is a deficient number, since it is larger than the sum of its proper divisors (1).

149787809 is an equidigital number, since it uses as much as digits as its factorization.

149787809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 149787809 is about 12238.7829868823. The cubic root of 149787809 is about 531.0786257102.

The spelling of 149787809 in words is "one hundred forty-nine million, seven hundred eighty-seven thousand, eight hundred nine".