242891399 has 2 divisors, whose sum is σ = 242891400. Its totient is φ = 242891398.

The previous prime is 242891381. The next prime is 242891401. The reversal of 242891399 is 993198242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242891399 - 2²⁰ = 241842823 is a prime.

Together with 242891401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242891309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121445699 + 121445700.

It is an arithmetic number, because the mean of its divisors is an integer number (121445700).

Almost surely, 2^242891399 is an apocalyptic number.

242891399 is a deficient number, since it is larger than the sum of its proper divisors (1).

242891399 is an equidigital number, since it uses as much as digits as its factorization.

242891399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 242891399 is about 15584.9735001379. The cubic root of 242891399 is about 623.9321704364.

The spelling of 242891399 in words is "two hundred forty-two million, eight hundred ninety-one thousand, three hundred ninety-nine".