243102151991 has 2 divisors, whose sum is σ = 243102151992. Its totient is φ = 243102151990.

The previous prime is 243102151973. The next prime is 243102152039. The reversal of 243102151991 is 199151201342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243102151991 - 2⁶ = 243102151927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243102151921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121551075995 + 121551075996.

It is an arithmetic number, because the mean of its divisors is an integer number (121551075996).

Almost surely, 2^243102151991 is an apocalyptic number.

243102151991 is a deficient number, since it is larger than the sum of its proper divisors (1).

243102151991 is an equidigital number, since it uses as much as digits as its factorization.

243102151991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The spelling of 243102151991 in words is "two hundred forty-three billion, one hundred two million, one hundred fifty-one thousand, nine hundred ninety-one".