154541021 has 2 divisors, whose sum is σ = 154541022. Its totient is φ = 154541020.

The previous prime is 154540973. The next prime is 154541081. The reversal of 154541021 is 120145451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149181796 + 5359225 = 12214^2 + 2315^2 .

It is a cyclic number.

It is not a de Polignac number, because 154541021 - 2⁶ = 154540957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154541081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77270510 + 77270511.

It is an arithmetic number, because the mean of its divisors is an integer number (77270511).

Almost surely, 2^154541021 is an apocalyptic number.

It is an amenable number.

154541021 is a deficient number, since it is larger than the sum of its proper divisors (1).

154541021 is an equidigital number, since it uses as much as digits as its factorization.

154541021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 154541021 is about 12431.4528917581. The cubic root of 154541021 is about 536.6377982148.

Adding to 154541021 its reverse (120145451), we get a palindrome (274686472).

The spelling of 154541021 in words is "one hundred fifty-four million, five hundred forty-one thousand, twenty-one".