154281242 has 4 divisors (see below), whose sum is σ = 231421866. Its totient is φ = 77140620.

The previous prime is 154281229. The next prime is 154281269. The reversal of 154281242 is 242182451.

It is a Cunningham number, because it is equal to 12421²+1.

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., 154281241 + 1 = 12421^2 + 1^2 .

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, 38570309 + ... + 38570312.

Almost surely, 2^154281242 is an apocalyptic number.

154281242 is a deficient number, since it is larger than the sum of its proper divisors (77140624).

154281242 is an equidigital number, since it uses as much as digits as its factorization.

154281242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77140623.

The product of its digits is 5120, while the sum is 29.

The square root of 154281242 is about 12421.0000402544. Note that the first 4 decimals coincide. The cubic root of 154281242 is about 536.3369386849.

The spelling of 154281242 in words is "one hundred fifty-four million, two hundred eighty-one thousand, two hundred forty-two".