243131521061 has 16 divisors (see below), whose sum is σ = 286832206080. Its totient is φ = 203172755520.

The previous prime is 243131521057. The next prime is 243131521081. The reversal of 243131521061 is 160125131342.

It is a cyclic number.

It is not a de Polignac number, because 243131521061 - 2² = 243131521057 is a prime.

It is a super-2 number, since 2×243131521061² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243131521001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3522770 + ... + 3591123.

It is an arithmetic number, because the mean of its divisors is an integer number (17927012880).

Almost surely, 2^243131521061 is an apocalyptic number.

It is an amenable number.

243131521061 is a deficient number, since it is larger than the sum of its proper divisors (43700685019).

243131521061 is a wasteful number, since it uses less digits than its factorization.

243131521061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114156.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 243131521061 in words is "two hundred forty-three billion, one hundred thirty-one million, five hundred twenty-one thousand, sixty-one".