238091591 has 2 divisors, whose sum is σ = 238091592. Its totient is φ = 238091590.

The previous prime is 238091573. The next prime is 238091593. The reversal of 238091591 is 195190832.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238091591 is a prime.

It is a super-2 number, since 2×238091591² = 113375211409822562, which contains 22 as substring.

Together with 238091593, 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 (238091593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119045795 + 119045796.

It is an arithmetic number, because the mean of its divisors is an integer number (119045796).

Almost surely, 2^238091591 is an apocalyptic number.

238091591 is a deficient number, since it is larger than the sum of its proper divisors (1).

238091591 is an equidigital number, since it uses as much as digits as its factorization.

238091591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 238091591 is about 15430.2168163639. The cubic root of 238091591 is about 619.7949295772.

The spelling of 238091591 in words is "two hundred thirty-eight million, ninety-one thousand, five hundred ninety-one".