154872521 has 2 divisors, whose sum is σ = 154872522. Its totient is φ = 154872520.

The previous prime is 154872511. The next prime is 154872587. The reversal of 154872521 is 125278451.

154872521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147282496 + 7590025 = 12136^2 + 2755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154872521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (154872511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77436260 + 77436261.

It is an arithmetic number, because the mean of its divisors is an integer number (77436261).

Almost surely, 2^154872521 is an apocalyptic number.

It is an amenable number.

154872521 is a deficient number, since it is larger than the sum of its proper divisors (1).

154872521 is an equidigital number, since it uses as much as digits as its factorization.

154872521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22400, while the sum is 35.

The square root of 154872521 is about 12444.7788650502. The cubic root of 154872521 is about 537.0212312163.

The spelling of 154872521 in words is "one hundred fifty-four million, eight hundred seventy-two thousand, five hundred twenty-one".