154449481 has 2 divisors, whose sum is σ = 154449482. Its totient is φ = 154449480.

The previous prime is 154449469. The next prime is 154449521. The reversal of 154449481 is 184944451.

It is a happy number.

It is an a-pointer prime, because the next prime (154449521) can be obtained adding 154449481 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120121600 + 34327881 = 10960^2 + 5859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154449481 is a prime.

It is a super-2 number, since 2×154449481² = 47709284362338722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (154449401) 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 as a sum of consecutive naturals, namely, 77224740 + 77224741.

It is an arithmetic number, because the mean of its divisors is an integer number (77224741).

Almost surely, 2^154449481 is an apocalyptic number.

It is an amenable number.

154449481 is a deficient number, since it is larger than the sum of its proper divisors (1).

154449481 is an equidigital number, since it uses as much as digits as its factorization.

154449481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 40.

The square root of 154449481 is about 12427.7705562985. The cubic root of 154449481 is about 536.5318209017.

The spelling of 154449481 in words is "one hundred fifty-four million, four hundred forty-nine thousand, four hundred eighty-one".