243121241519 has 4 divisors (see below), whose sum is σ = 261822875496. Its totient is φ = 224419607544.

The previous prime is 243121241507. The next prime is 243121241617. The reversal of 243121241519 is 915142121342.

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

It is a cyclic number.

It is not a de Polignac number, because 243121241519 - 2¹² = 243121237423 is a prime.

It is a super-2 number, since 2×243121241519² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121241819) 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, 9350816969 + ... + 9350816994.

It is an arithmetic number, because the mean of its divisors is an integer number (65455718874).

Almost surely, 2^243121241519 is an apocalyptic number.

243121241519 is a deficient number, since it is larger than the sum of its proper divisors (18701633977).

243121241519 is a wasteful number, since it uses less digits than its factorization.

243121241519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18701633976.

The product of its digits is 17280, while the sum is 35.

The spelling of 243121241519 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-one thousand, five hundred nineteen".