155224885 has 4 divisors (see below), whose sum is σ = 186269868. Its totient is φ = 124179904.

The previous prime is 155224873. The next prime is 155224891. The reversal of 155224885 is 588422551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28121809 + 127103076 = 5303^2 + 11274^2 .

It is a cyclic number.

It is not a de Polignac number, because 155224885 - 2⁹ = 155224373 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 15522484 + ... + 15522493.

It is an arithmetic number, because the mean of its divisors is an integer number (46567467).

Almost surely, 2^155224885 is an apocalyptic number.

It is an amenable number.

155224885 is a deficient number, since it is larger than the sum of its proper divisors (31044983).

155224885 is an equidigital number, since it uses as much as digits as its factorization.

155224885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31044982.

The product of its digits is 128000, while the sum is 40.

The square root of 155224885 is about 12458.9279233809. The cubic root of 155224885 is about 537.4281973673.

The spelling of 155224885 in words is "one hundred fifty-five million, two hundred twenty-four thousand, eight hundred eighty-five".