155178242 has 4 divisors (see below), whose sum is σ = 232767366. Its totient is φ = 77589120.

The previous prime is 155178241. The next prime is 155178251. The reversal of 155178242 is 242871551.

155178242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 109223401 + 45954841 = 10451^2 + 6779^2 .

It is not an unprimeable number, because it can be changed into a prime (155178241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38794559 + ... + 38794562.

Almost surely, 2^155178242 is an apocalyptic number.

155178242 is a deficient number, since it is larger than the sum of its proper divisors (77589124).

155178242 is an equidigital number, since it uses as much as digits as its factorization.

155178242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77589123.

The product of its digits is 22400, while the sum is 35.

The square root of 155178242 is about 12457.0559122130. The cubic root of 155178242 is about 537.3743619817.

The spelling of 155178242 in words is "one hundred fifty-five million, one hundred seventy-eight thousand, two hundred forty-two".