154144021 has 2 divisors, whose sum is σ = 154144022. Its totient is φ = 154144020.

The previous prime is 154144009. The next prime is 154144027. The reversal of 154144021 is 120441451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153412996 + 731025 = 12386^2 + 855^2 .

It is a cyclic number.

It is not a de Polignac number, because 154144021 - 2⁵ = 154143989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 154143983 and 154144001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154144027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77072010 + 77072011.

It is an arithmetic number, because the mean of its divisors is an integer number (77072011).

Almost surely, 2^154144021 is an apocalyptic number.

It is an amenable number.

154144021 is a deficient number, since it is larger than the sum of its proper divisors (1).

154144021 is an equidigital number, since it uses as much as digits as its factorization.

154144021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 154144021 is about 12415.4750613901. The cubic root of 154144021 is about 536.1778817134.

Adding to 154144021 its reverse (120441451), we get a palindrome (274585472).

The spelling of 154144021 in words is "one hundred fifty-four million, one hundred forty-four thousand, twenty-one".