155152321 has 2 divisors, whose sum is σ = 155152322. Its totient is φ = 155152320.

The previous prime is 155152307. The next prime is 155152331. The reversal of 155152321 is 123251551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93702400 + 61449921 = 9680^2 + 7839^2 .

It is a cyclic number.

It is not a de Polignac number, because 155152321 - 2⁵ = 155152289 is a prime.

It is not a weakly prime, because it can be changed into another prime (155152301) 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, 77576160 + 77576161.

It is an arithmetic number, because the mean of its divisors is an integer number (77576161).

Almost surely, 2^155152321 is an apocalyptic number.

It is an amenable number.

155152321 is a deficient number, since it is larger than the sum of its proper divisors (1).

155152321 is an equidigital number, since it uses as much as digits as its factorization.

155152321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1500, while the sum is 25.

The square root of 155152321 is about 12456.0154543899. The cubic root of 155152321 is about 537.3444392805.

The spelling of 155152321 in words is "one hundred fifty-five million, one hundred fifty-two thousand, three hundred twenty-one".