149206309 has 4 divisors (see below), whose sum is σ = 170521504. Its totient is φ = 127891116.

The previous prime is 149206303. The next prime is 149206349. The reversal of 149206309 is 903602941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 149206309 - 2³ = 149206301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149206301) 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 in 3 ways as a sum of consecutive naturals, for example, 10657587 + ... + 10657600.

It is an arithmetic number, because the mean of its divisors is an integer number (42630376).

Almost surely, 2^149206309 is an apocalyptic number.

It is an amenable number.

149206309 is a deficient number, since it is larger than the sum of its proper divisors (21315195).

149206309 is an equidigital number, since it uses as much as digits as its factorization.

149206309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21315194.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 149206309 is about 12215.0034383949. The cubic root of 149206309 is about 530.3904906758.

The spelling of 149206309 in words is "one hundred forty-nine million, two hundred six thousand, three hundred nine".