238553891 has 2 divisors, whose sum is σ = 238553892. Its totient is φ = 238553890.

The previous prime is 238553863. The next prime is 238553921. The reversal of 238553891 is 198355832.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 238553891 - 2⁶ = 238553827 is a prime.

It is a super-2 number, since 2×238553891² = 113815917822479762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (238553831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119276945 + 119276946.

It is an arithmetic number, because the mean of its divisors is an integer number (119276946).

Almost surely, 2^238553891 is an apocalyptic number.

238553891 is a deficient number, since it is larger than the sum of its proper divisors (1).

238553891 is an equidigital number, since it uses as much as digits as its factorization.

238553891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 44.

The square root of 238553891 is about 15445.1898984765. The cubic root of 238553891 is about 620.1958200398.

The spelling of 238553891 in words is "two hundred thirty-eight million, five hundred fifty-three thousand, eight hundred ninety-one".