154142209 has 4 divisors (see below), whose sum is σ = 165999316. Its totient is φ = 142285104.

The previous prime is 154142173. The next prime is 154142227. The reversal of 154142209 is 902241451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 902241451 = 229 ⋅3939919.

It can be written as a sum of positive squares in 2 ways, for example, as 98565184 + 55577025 = 9928^2 + 7455^2 .

It is not a de Polignac number, because 154142209 - 2⁹ = 154141697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154142239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5928534 + ... + 5928559.

It is an arithmetic number, because the mean of its divisors is an integer number (41499829).

Almost surely, 2^154142209 is an apocalyptic number.

It is an amenable number.

154142209 is a deficient number, since it is larger than the sum of its proper divisors (11857107).

154142209 is a wasteful number, since it uses less digits than its factorization.

154142209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11857106.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 154142209 is about 12415.4020877296. The cubic root of 154142209 is about 536.1757807386.

The spelling of 154142209 in words is "one hundred fifty-four million, one hundred forty-two thousand, two hundred nine".