155420585 has 8 divisors (see below), whose sum is σ = 186686856. Its totient is φ = 124215040.

The previous prime is 155420581. The next prime is 155420597. The reversal of 155420585 is 585024551.

It can be written as a sum of positive squares in 4 ways, for example, as 36348841 + 119071744 = 6029^2 + 10912^2 .

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

It is not a de Polignac number, because 155420585 - 2² = 155420581 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155420581) 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, 9344 + ... + 19953.

It is an arithmetic number, because the mean of its divisors is an integer number (23335857).

Almost surely, 2^155420585 is an apocalyptic number.

It is an amenable number.

155420585 is a deficient number, since it is larger than the sum of its proper divisors (31266271).

155420585 is a wasteful number, since it uses less digits than its factorization.

155420585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30363.

The product of its (nonzero) digits is 40000, while the sum is 35.

The square root of 155420585 is about 12466.7792552848. The cubic root of 155420585 is about 537.6539569793.

The spelling of 155420585 in words is "one hundred fifty-five million, four hundred twenty thousand, five hundred eighty-five".