243441099991 has 2 divisors, whose sum is σ = 243441099992. Its totient is φ = 243441099990.

The previous prime is 243441099907. The next prime is 243441100013. The reversal of 243441099991 is 199990144342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243441099991 - 2⁹ = 243441099479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243441099791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121720549995 + 121720549996.

It is an arithmetic number, because the mean of its divisors is an integer number (121720549996).

Almost surely, 2^243441099991 is an apocalyptic number.

243441099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

243441099991 is an equidigital number, since it uses as much as digits as its factorization.

243441099991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The spelling of 243441099991 in words is "two hundred forty-three billion, four hundred forty-one million, ninety-nine thousand, nine hundred ninety-one".