144554021 has 4 divisors (see below), whose sum is σ = 145352844. Its totient is φ = 143755200.

The previous prime is 144554017. The next prime is 144554027. The reversal of 144554021 is 120455441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120455441 = 307 ⋅392363.

It can be written as a sum of positive squares in 2 ways, for example, as 47748100 + 96805921 = 6910^2 + 9839^2 .

It is a cyclic number.

It is not a de Polignac number, because 144554021 - 2² = 144554017 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 (144554027) 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, 399140 + ... + 399501.

It is an arithmetic number, because the mean of its divisors is an integer number (36338211).

Almost surely, 2^144554021 is an apocalyptic number.

It is an amenable number.

144554021 is a deficient number, since it is larger than the sum of its proper divisors (798823).

144554021 is an equidigital number, since it uses as much as digits as its factorization.

144554021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798822.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 144554021 is about 12023.0620475817. The cubic root of 144554021 is about 524.8196157312.

The spelling of 144554021 in words is "one hundred forty-four million, five hundred fifty-four thousand, twenty-one".