157242243 has 4 divisors (see below), whose sum is σ = 209656328. Its totient is φ = 104828160.

The previous prime is 157242223. The next prime is 157242289. The reversal of 157242243 is 342242751.

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

It is not a de Polignac number, because 157242243 - 2⁶ = 157242179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157242243.

It is not an unprimeable number, because it can be changed into a prime (157242223) 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, 26207038 + ... + 26207043.

It is an arithmetic number, because the mean of its divisors is an integer number (52414082).

Almost surely, 2^157242243 is an apocalyptic number.

157242243 is a deficient number, since it is larger than the sum of its proper divisors (52414085).

157242243 is an equidigital number, since it uses as much as digits as its factorization.

157242243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52414084.

The product of its digits is 13440, while the sum is 30.

The square root of 157242243 is about 12539.6269083255. The cubic root of 157242243 is about 539.7463863948.

Adding to 157242243 its reverse (342242751), we get a palindrome (499484994).

The spelling of 157242243 in words is "one hundred fifty-seven million, two hundred forty-two thousand, two hundred forty-three".