243111217404691 has 2 divisors, whose sum is σ = 243111217404692. Its totient is φ = 243111217404690.

The previous prime is 243111217404589. The next prime is 243111217404773. The reversal of 243111217404691 is 196404712111342.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243111217404691 - 2⁷ = 243111217404563 is a prime.

It is not a weakly prime, because it can be changed into another prime (243111217404791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121555608702345 + 121555608702346.

It is an arithmetic number, because the mean of its divisors is an integer number (121555608702346).

Almost surely, 2^{243111217404691} is an apocalyptic number.

243111217404691 is a deficient number, since it is larger than the sum of its proper divisors (1).

243111217404691 is an equidigital number, since it uses as much as digits as its factorization.

243111217404691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 243111217404691 in words is "two hundred forty-three trillion, one hundred eleven billion, two hundred seventeen million, four hundred four thousand, six hundred ninety-one".