238891111 has 2 divisors, whose sum is σ = 238891112. Its totient is φ = 238891110.

The previous prime is 238891091. The next prime is 238891127. The reversal of 238891111 is 111198832.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 238891111 - 2¹⁵ = 238858343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238891811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119445555 + 119445556.

It is an arithmetic number, because the mean of its divisors is an integer number (119445556).

Almost surely, 2^238891111 is an apocalyptic number.

238891111 is a deficient number, since it is larger than the sum of its proper divisors (1).

238891111 is an equidigital number, since it uses as much as digits as its factorization.

238891111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 34.

The square root of 238891111 is about 15456.1027105801. The cubic root of 238891111 is about 620.4879189067.

The spelling of 238891111 in words is "two hundred thirty-eight million, eight hundred ninety-one thousand, one hundred eleven".