243145155 has 16 divisors (see below), whose sum is σ = 424399104. Its totient is φ = 117888480.

The previous prime is 243145139. The next prime is 243145157. The reversal of 243145155 is 551541342.

It is not a de Polignac number, because 243145155 - 2⁴ = 243145139 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (243145157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736639 + ... + 736968.

It is an arithmetic number, because the mean of its divisors is an integer number (26524944).

Almost surely, 2^243145155 is an apocalyptic number.

243145155 is a deficient number, since it is larger than the sum of its proper divisors (181253949).

243145155 is a wasteful number, since it uses less digits than its factorization.

243145155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473626.

The product of its digits is 12000, while the sum is 30.

The square root of 243145155 is about 15593.1124218355. The cubic root of 243145155 is about 624.1493750915.

Adding to 243145155 its reverse (551541342), we get a palindrome (794686497).

It can be divided in two parts, 2431 and 45155, that added together give a triangular number (47586 = T₃₀₈).

The spelling of 243145155 in words is "two hundred forty-three million, one hundred forty-five thousand, one hundred fifty-five".