149933909 has 4 divisors (see below), whose sum is σ = 149995680. Its totient is φ = 149872140.

The previous prime is 149933881. The next prime is 149933923. The reversal of 149933909 is 909339941.

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, and also an emirpimes, since its reverse is a distinct semiprime: 909339941 = 1997 ⋅455353.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149933909 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 (149933929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27089 + ... + 32150.

It is an arithmetic number, because the mean of its divisors is an integer number (37498920).

Almost surely, 2^149933909 is an apocalyptic number.

It is an amenable number.

149933909 is a deficient number, since it is larger than the sum of its proper divisors (61771).

149933909 is an equidigital number, since it uses as much as digits as its factorization.

149933909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61770.

The product of its (nonzero) digits is 236196, while the sum is 47.

The square root of 149933909 is about 12244.7502628678. The cubic root of 149933909 is about 531.2512373858.

The spelling of 149933909 in words is "one hundred forty-nine million, nine hundred thirty-three thousand, nine hundred nine".