155105242 has 8 divisors (see below), whose sum is σ = 237047796. Its totient is φ = 76089312.

The previous prime is 155105239. The next prime is 155105243. The reversal of 155105242 is 242501551.

It can be written as a sum of positive squares in 2 ways, for example, as 155027401 + 77841 = 12451^2 + 279^2 .

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

It is not an unprimeable number, because it can be changed into a prime (155105243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731523 + ... + 731734.

Almost surely, 2^155105242 is an apocalyptic number.

155105242 is a deficient number, since it is larger than the sum of its proper divisors (81942554).

155105242 is a wasteful number, since it uses less digits than its factorization.

155105242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463312.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 155105242 is about 12454.1255012144. The cubic root of 155105242 is about 537.2900836686.

Adding to 155105242 its reverse (242501551), we get a palindrome (397606793).

The spelling of 155105242 in words is "one hundred fifty-five million, one hundred five thousand, two hundred forty-two".