154465021 has 2 divisors, whose sum is σ = 154465022. Its totient is φ = 154465020.

The previous prime is 154465019. The next prime is 154465039. The reversal of 154465021 is 120564451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134304921 + 20160100 = 11589^2 + 4490^2 .

It is a cyclic number.

It is not a de Polignac number, because 154465021 - 2¹ = 154465019 is a prime.

Together with 154465019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154465061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77232510 + 77232511.

It is an arithmetic number, because the mean of its divisors is an integer number (77232511).

Almost surely, 2^154465021 is an apocalyptic number.

It is an amenable number.

154465021 is a deficient number, since it is larger than the sum of its proper divisors (1).

154465021 is an equidigital number, since it uses as much as digits as its factorization.

154465021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 154465021 is about 12428.3957532740. The cubic root of 154465021 is about 536.5498147571.

The spelling of 154465021 in words is "one hundred fifty-four million, four hundred sixty-five thousand, twenty-one".