149536609 has 4 divisors (see below), whose sum is σ = 149674516. Its totient is φ = 149398704.

The previous prime is 149536603. The next prime is 149536627. The reversal of 149536609 is 906635941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 906635941 = 1009 ⋅898549.

It can be written as a sum of positive squares in 2 ways, for example, as 135210384 + 14326225 = 11628^2 + 3785^2 .

It is a cyclic number.

It is not a de Polignac number, because 149536609 - 2³ = 149536601 is a prime.

It is a super-2 number, since 2×149536609² = 44722394862437762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149536601) 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, 67314 + ... + 69499.

It is an arithmetic number, because the mean of its divisors is an integer number (37418629).

Almost surely, 2^149536609 is an apocalyptic number.

It is an amenable number.

149536609 is a deficient number, since it is larger than the sum of its proper divisors (137907).

149536609 is a wasteful number, since it uses less digits than its factorization.

149536609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137906.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 149536609 is about 12228.5162223387. The cubic root of 149536609 is about 530.7815797368.

The spelling of 149536609 in words is "one hundred forty-nine million, five hundred thirty-six thousand, six hundred nine".