154444421 has 4 divisors (see below), whose sum is σ = 156560172. Its totient is φ = 152328672.

The previous prime is 154444399. The next prime is 154444457. The reversal of 154444421 is 124444451.

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 105863521 + 48580900 = 10289^2 + 6970^2 .

It is a cyclic number.

It is not a de Polignac number, because 154444421 - 2¹⁴ = 154428037 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 (154444481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057766 + ... + 1057911.

It is an arithmetic number, because the mean of its divisors is an integer number (39140043).

Almost surely, 2^154444421 is an apocalyptic number.

It is an amenable number.

154444421 is a deficient number, since it is larger than the sum of its proper divisors (2115751).

154444421 is an equidigital number, since it uses as much as digits as its factorization.

154444421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115750.

The product of its digits is 10240, while the sum is 29.

The square root of 154444421 is about 12427.5669782947. The cubic root of 154444421 is about 536.5259616382.

Adding to 154444421 its reverse (124444451), we get a palindrome (278888872).

The spelling of 154444421 in words is "one hundred fifty-four million, four hundred forty-four thousand, four hundred twenty-one".