155526121 has 2 divisors, whose sum is σ = 155526122. Its totient is φ = 155526120.

The previous prime is 155526113. The next prime is 155526167. The reversal of 155526121 is 121625551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115025625 + 40500496 = 10725^2 + 6364^2 .

It is a cyclic number.

It is not a de Polignac number, because 155526121 - 2³ = 155526113 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155526121.

It is not a weakly prime, because it can be changed into another prime (155524121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77763060 + 77763061.

It is an arithmetic number, because the mean of its divisors is an integer number (77763061).

Almost surely, 2^155526121 is an apocalyptic number.

It is an amenable number.

155526121 is a deficient number, since it is larger than the sum of its proper divisors (1).

155526121 is an equidigital number, since it uses as much as digits as its factorization.

155526121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000, while the sum is 28.

The square root of 155526121 is about 12471.0112260394. The cubic root of 155526121 is about 537.7756247100.

The spelling of 155526121 in words is "one hundred fifty-five million, five hundred twenty-six thousand, one hundred twenty-one".