243412691 has 2 divisors, whose sum is σ = 243412692. Its totient is φ = 243412690.

The previous prime is 243412679. The next prime is 243412721. The reversal of 243412691 is 196214342.

243412691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243412691 - 2¹⁰ = 243411667 is a prime.

It is a super-2 number, since 2×243412691² = 118499476279722962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243412661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121706345 + 121706346.

It is an arithmetic number, because the mean of its divisors is an integer number (121706346).

Almost surely, 2^243412691 is an apocalyptic number.

243412691 is a deficient number, since it is larger than the sum of its proper divisors (1).

243412691 is an equidigital number, since it uses as much as digits as its factorization.

243412691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 243412691 is about 15601.6887226992. The cubic root of 243412691 is about 624.3782112645.

The spelling of 243412691 in words is "two hundred forty-three million, four hundred twelve thousand, six hundred ninety-one".