243023191 has 2 divisors, whose sum is σ = 243023192. Its totient is φ = 243023190.

The previous prime is 243023173. The next prime is 243023201. The reversal of 243023191 is 191320342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243023191 - 2⁷ = 243023063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243023101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121511595 + 121511596.

It is an arithmetic number, because the mean of its divisors is an integer number (121511596).

Almost surely, 2^243023191 is an apocalyptic number.

243023191 is a deficient number, since it is larger than the sum of its proper divisors (1).

243023191 is an equidigital number, since it uses as much as digits as its factorization.

243023191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 243023191 is about 15589.2011020450. The cubic root of 243023191 is about 624.0449978166.

The spelling of 243023191 in words is "two hundred forty-three million, twenty-three thousand, one hundred ninety-one".