155442561 has 8 divisors (see below), whose sum is σ = 207990240. Its totient is φ = 103261632.

The previous prime is 155442559. The next prime is 155442569. The reversal of 155442561 is 165244551.

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

It is not a de Polignac number, because 155442561 - 2¹ = 155442559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155442569) 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 in 7 ways as a sum of consecutive naturals, for example, 90696 + ... + 92393.

It is an arithmetic number, because the mean of its divisors is an integer number (25998780).

Almost surely, 2^155442561 is an apocalyptic number.

It is an amenable number.

155442561 is a deficient number, since it is larger than the sum of its proper divisors (52547679).

155442561 is a wasteful number, since it uses less digits than its factorization.

155442561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183375.

The product of its digits is 24000, while the sum is 33.

The square root of 155442561 is about 12467.6606065452. The cubic root of 155442561 is about 537.6792966654.

The spelling of 155442561 in words is "one hundred fifty-five million, four hundred forty-two thousand, five hundred sixty-one".