153540242 has 4 divisors (see below), whose sum is σ = 230310366. Its totient is φ = 76770120.

The previous prime is 153540223. The next prime is 153540307. The reversal of 153540242 is 242045351.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242045351 = 19 ⋅12739229.

It can be written as a sum of positive squares in only one way, i.e., 152497801 + 1042441 = 12349^2 + 1021^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38385059 + ... + 38385062.

Almost surely, 2^153540242 is an apocalyptic number.

153540242 is a deficient number, since it is larger than the sum of its proper divisors (76770124).

153540242 is an equidigital number, since it uses as much as digits as its factorization.

153540242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76770123.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 153540242 is about 12391.1356218871. The cubic root of 153540242 is about 535.4768997130.

Adding to 153540242 its reverse (242045351), we get a palindrome (395585593).

The spelling of 153540242 in words is "one hundred fifty-three million, five hundred forty thousand, two hundred forty-two".