155444242 has 4 divisors (see below), whose sum is σ = 233166366. Its totient is φ = 77722120.

The previous prime is 155444227. The next prime is 155444257. The reversal of 155444242 is 242444551.

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

It is an interprime number because it is at equal distance from previous prime (155444227) and next prime (155444257).

It can be written as a sum of positive squares in only one way, i.e., 150332121 + 5112121 = 12261^2 + 2261^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 38861059 + ... + 38861062.

Almost surely, 2^155444242 is an apocalyptic number.

155444242 is a deficient number, since it is larger than the sum of its proper divisors (77722124).

155444242 is an equidigital number, since it uses as much as digits as its factorization.

155444242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77722123.

The product of its digits is 25600, while the sum is 31.

The square root of 155444242 is about 12467.7280207743. The cubic root of 155444242 is about 537.6812348640.

Adding to 155444242 its reverse (242444551), we get a palindrome (397888793).

It can be divided in two parts, 1554 and 44242, that added together give a square (45796 = 214²).

The spelling of 155444242 in words is "one hundred fifty-five million, four hundred forty-four thousand, two hundred forty-two".