149780509 has 2 divisors, whose sum is σ = 149780510. Its totient is φ = 149780508.

The previous prime is 149780507. The next prime is 149780573. The reversal of 149780509 is 905087941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149377284 + 403225 = 12222^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 149780509 - 2¹ = 149780507 is a prime.

Together with 149780507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149780507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74890254 + 74890255.

It is an arithmetic number, because the mean of its divisors is an integer number (74890255).

Almost surely, 2^149780509 is an apocalyptic number.

It is an amenable number.

149780509 is a deficient number, since it is larger than the sum of its proper divisors (1).

149780509 is an equidigital number, since it uses as much as digits as its factorization.

149780509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 149780509 is about 12238.4847509812. The cubic root of 149780509 is about 531.0699980900.

The spelling of 149780509 in words is "one hundred forty-nine million, seven hundred eighty thousand, five hundred nine".