243155340531 has 32 divisors (see below), whose sum is σ = 361937160000. Its totient is φ = 161336634624.

The previous prime is 243155340497. The next prime is 243155340541. The reversal of 243155340531 is 135043551342.

243155340531 is a `hidden beast` number, since 2 + 4 + 31 + 5 + 53 + 40 + 531 = 666.

It is not a de Polignac number, because 243155340531 - 2⁷ = 243155340403 is a prime.

It is a super-2 number, since 2×243155340531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243155340541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7340895 + ... + 7373943.

It is an arithmetic number, because the mean of its divisors is an integer number (11310536250).

Almost surely, 2^243155340531 is an apocalyptic number.

243155340531 is a deficient number, since it is larger than the sum of its proper divisors (118781819469).

243155340531 is a wasteful number, since it uses less digits than its factorization.

243155340531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34340 (or 34334 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 243155340531 its reverse (135043551342), we get a palindrome (378198891873).

The spelling of 243155340531 in words is "two hundred forty-three billion, one hundred fifty-five million, three hundred forty thousand, five hundred thirty-one".