243240501391 has 2 divisors, whose sum is σ = 243240501392. Its totient is φ = 243240501390.

The previous prime is 243240501359. The next prime is 243240501403. The reversal of 243240501391 is 193105042342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243240501391 - 2⁵ = 243240501359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243240504391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121620250695 + 121620250696.

It is an arithmetic number, because the mean of its divisors is an integer number (121620250696).

Almost surely, 2^243240501391 is an apocalyptic number.

243240501391 is a deficient number, since it is larger than the sum of its proper divisors (1).

243240501391 is an equidigital number, since it uses as much as digits as its factorization.

243240501391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 243240501391 in words is "two hundred forty-three billion, two hundred forty million, five hundred one thousand, three hundred ninety-one".