154671521 has 2 divisors, whose sum is σ = 154671522. Its totient is φ = 154671520.

The previous prime is 154671511. The next prime is 154671541. The reversal of 154671521 is 125176451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150307600 + 4363921 = 12260^2 + 2089^2 .

It is an emirp because it is prime and its reverse (125176451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154671521 - 2¹⁰ = 154670497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (154671511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77335760 + 77335761.

It is an arithmetic number, because the mean of its divisors is an integer number (77335761).

Almost surely, 2^154671521 is an apocalyptic number.

It is an amenable number.

154671521 is a deficient number, since it is larger than the sum of its proper divisors (1).

154671521 is an equidigital number, since it uses as much as digits as its factorization.

154671521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 32.

The square root of 154671521 is about 12436.7005672727. The cubic root of 154671521 is about 536.7888078069.

The spelling of 154671521 in words is "one hundred fifty-four million, six hundred seventy-one thousand, five hundred twenty-one".