243407928109 has 2 divisors, whose sum is σ = 243407928110. Its totient is φ = 243407928108.

The previous prime is 243407928107. The next prime is 243407928139. The reversal of 243407928109 is 901829704342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148318954884 + 95088973225 = 385122^2 + 308365^2 .

It is a cyclic number.

It is not a de Polignac number, because 243407928109 - 2¹ = 243407928107 is a prime.

It is a super-2 number, since 2×243407928109² (a number of 24 digits) contains 22 as substring.

Together with 243407928107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243407928107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121703964054 + 121703964055.

It is an arithmetic number, because the mean of its divisors is an integer number (121703964055).

Almost surely, 2^243407928109 is an apocalyptic number.

It is an amenable number.

243407928109 is a deficient number, since it is larger than the sum of its proper divisors (1).

243407928109 is an equidigital number, since it uses as much as digits as its factorization.

243407928109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 243407928109 in words is "two hundred forty-three billion, four hundred seven million, nine hundred twenty-eight thousand, one hundred nine".