155240243 has 4 divisors (see below), whose sum is σ = 164372040. Its totient is φ = 146108448.

The previous prime is 155240213. The next prime is 155240251. The reversal of 155240243 is 342042551.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155240243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155240213) 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, 4565873 + ... + 4565906.

It is an arithmetic number, because the mean of its divisors is an integer number (41093010).

Almost surely, 2^155240243 is an apocalyptic number.

155240243 is a deficient number, since it is larger than the sum of its proper divisors (9131797).

155240243 is an equidigital number, since it uses as much as digits as its factorization.

155240243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9131796.

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

The square root of 155240243 is about 12459.5442533024. The cubic root of 155240243 is about 537.4459212223.

Adding to 155240243 its reverse (342042551), we get a palindrome (497282794).

The spelling of 155240243 in words is "one hundred fifty-five million, two hundred forty thousand, two hundred forty-three".