155521241 has 8 divisors (see below), whose sum is σ = 159667200. Its totient is φ = 151392160.

The previous prime is 155521211. The next prime is 155521243. The reversal of 155521241 is 142125551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155521241 - 2¹⁴ = 155504857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155521241.

It is not an unprimeable number, because it can be changed into a prime (155521243) 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 in 7 ways as a sum of consecutive naturals, for example, 15680 + ... + 23598.

It is an arithmetic number, because the mean of its divisors is an integer number (19958400).

Almost surely, 2^155521241 is an apocalyptic number.

It is an amenable number.

155521241 is a deficient number, since it is larger than the sum of its proper divisors (4145959).

155521241 is an equidigital number, since it uses as much as digits as its factorization.

155521241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8439.

The product of its digits is 2000, while the sum is 26.

The square root of 155521241 is about 12470.8155707636. The cubic root of 155521241 is about 537.7699999903.

Adding to 155521241 its reverse (142125551), we get a palindrome (297646792).

The spelling of 155521241 in words is "one hundred fifty-five million, five hundred twenty-one thousand, two hundred forty-one".