149684809 has 4 divisors (see below), whose sum is σ = 153335700. Its totient is φ = 146033920.

The previous prime is 149684803. The next prime is 149684837. The reversal of 149684809 is 908486941.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4410000 + 145274809 = 2100^2 + 12053^2 .

It is a cyclic number.

It is not a de Polignac number, because 149684809 - 2¹⁷ = 149553737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149684803) 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, 1825384 + ... + 1825465.

It is an arithmetic number, because the mean of its divisors is an integer number (38333925).

Almost surely, 2^149684809 is an apocalyptic number.

It is an amenable number.

149684809 is a deficient number, since it is larger than the sum of its proper divisors (3650891).

149684809 is an equidigital number, since it uses as much as digits as its factorization.

149684809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650890.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 149684809 is about 12234.5743285167. The cubic root of 149684809 is about 530.9568676004.

The spelling of 149684809 in words is "one hundred forty-nine million, six hundred eighty-four thousand, eight hundred nine".