154454221 has 2 divisors, whose sum is σ = 154454222. Its totient is φ = 154454220.

The previous prime is 154454207. The next prime is 154454239. The reversal of 154454221 is 122454451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112593321 + 41860900 = 10611^2 + 6470^2 .

It is a cyclic number.

It is not a de Polignac number, because 154454221 - 2¹⁵ = 154421453 is a prime.

It is a super-2 number, since 2×154454221² = 47712212769433682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 154454221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154454291) 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, 77227110 + 77227111.

It is an arithmetic number, because the mean of its divisors is an integer number (77227111).

Almost surely, 2^154454221 is an apocalyptic number.

It is an amenable number.

154454221 is a deficient number, since it is larger than the sum of its proper divisors (1).

154454221 is an equidigital number, since it uses as much as digits as its factorization.

154454221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6400, while the sum is 28.

The square root of 154454221 is about 12427.9612567790. The cubic root of 154454221 is about 536.5373095029.

The spelling of 154454221 in words is "one hundred fifty-four million, four hundred fifty-four thousand, two hundred twenty-one".