154423109 has 4 divisors (see below), whose sum is σ = 154447980. Its totient is φ = 154398240.

The previous prime is 154423091. The next prime is 154423111. The reversal of 154423109 is 901324451.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 130462084 + 23961025 = 11422^2 + 4895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154423109 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 (154423169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5537 + ... + 18425.

It is an arithmetic number, because the mean of its divisors is an integer number (38611995).

Almost surely, 2^154423109 is an apocalyptic number.

It is an amenable number.

154423109 is a deficient number, since it is larger than the sum of its proper divisors (24871).

154423109 is a wasteful number, since it uses less digits than its factorization.

154423109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24870.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 154423109 is about 12426.7095001050. The cubic root of 154423109 is about 536.5012818489.

The spelling of 154423109 in words is "one hundred fifty-four million, four hundred twenty-three thousand, one hundred nine".