243411909531 has 16 divisors (see below), whose sum is σ = 372505296384. Its totient is φ = 138495553344.

The previous prime is 243411909493. The next prime is 243411909539. The reversal of 243411909531 is 135909114342.

It is not a de Polignac number, because 243411909531 - 2¹⁷ = 243411778459 is a prime.

It is a super-2 number, since 2×243411909531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243411909539) 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, 24868591 + ... + 24878376.

It is an arithmetic number, because the mean of its divisors is an integer number (23281581024).

Almost surely, 2^243411909531 is an apocalyptic number.

243411909531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

243411909531 is a deficient number, since it is larger than the sum of its proper divisors (129093386853).

243411909531 is a wasteful number, since it uses less digits than its factorization.

243411909531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49747210.

The product of its (nonzero) digits is 116640, while the sum is 42.

The spelling of 243411909531 in words is "two hundred forty-three billion, four hundred eleven million, nine hundred nine thousand, five hundred thirty-one".