242161391 has 2 divisors, whose sum is σ = 242161392. Its totient is φ = 242161390.

The previous prime is 242161363. The next prime is 242161417. The reversal of 242161391 is 193161242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242161391 - 2²² = 237967087 is a prime.

It is a Chen prime.

It is equal to p_13273643 and since 242161391 and 13273643 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242161291) 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, 121080695 + 121080696.

It is an arithmetic number, because the mean of its divisors is an integer number (121080696).

Almost surely, 2^242161391 is an apocalyptic number.

242161391 is a deficient number, since it is larger than the sum of its proper divisors (1).

242161391 is an equidigital number, since it uses as much as digits as its factorization.

242161391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 242161391 is about 15561.5356247383. The cubic root of 242161391 is about 623.3064689221.

The spelling of 242161391 in words is "two hundred forty-two million, one hundred sixty-one thousand, three hundred ninety-one".