243121245145 has 8 divisors (see below), whose sum is σ = 291757915080. Its totient is φ = 194488715520.

The previous prime is 243121245109. The next prime is 243121245181. The reversal of 243121245145 is 541542121342.

It is an interprime number because it is at equal distance from previous prime (243121245109) and next prime (243121245181).

It can be written as a sum of positive squares in 4 ways, for example, as 53718723529 + 189402521616 = 231773^2 + 435204^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 243121245145 - 2²⁹ = 242584374233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243121245145.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 904390 + ... + 1141999.

It is an arithmetic number, because the mean of its divisors is an integer number (36469739385).

Almost surely, 2^243121245145 is an apocalyptic number.

It is an amenable number.

243121245145 is a deficient number, since it is larger than the sum of its proper divisors (48636669935).

243121245145 is a wasteful number, since it uses less digits than its factorization.

243121245145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070155.

The product of its digits is 38400, while the sum is 34.

Adding to 243121245145 its reverse (541542121342), we get a palindrome (784663366487).

The spelling of 243121245145 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, one hundred forty-five".