243276697991 has 2 divisors, whose sum is σ = 243276697992. Its totient is φ = 243276697990.

The previous prime is 243276697973. The next prime is 243276697999. The reversal of 243276697991 is 199796672342.

243276697991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243276697991 - 2³⁴ = 226096828807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243276697999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121638348995 + 121638348996.

It is an arithmetic number, because the mean of its divisors is an integer number (121638348996).

Almost surely, 2^243276697991 is an apocalyptic number.

243276697991 is a deficient number, since it is larger than the sum of its proper divisors (1).

243276697991 is an equidigital number, since it uses as much as digits as its factorization.

243276697991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61725888, while the sum is 65.

The spelling of 243276697991 in words is "two hundred forty-three billion, two hundred seventy-six million, six hundred ninety-seven thousand, nine hundred ninety-one".