238182991 has 2 divisors, whose sum is σ = 238182992. Its totient is φ = 238182990.

The previous prime is 238182961. The next prime is 238183019. The reversal of 238182991 is 199281832.

238182991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 238182991 - 2¹⁹ = 237658703 is a prime.

It is a super-2 number, since 2×238182991² = 113462274403412162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238182961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119091495 + 119091496.

It is an arithmetic number, because the mean of its divisors is an integer number (119091496).

Almost surely, 2^238182991 is an apocalyptic number.

238182991 is a deficient number, since it is larger than the sum of its proper divisors (1).

238182991 is an equidigital number, since it uses as much as digits as its factorization.

238182991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 43.

The square root of 238182991 is about 15433.1782533605. The cubic root of 238182991 is about 619.8742296047.

The spelling of 238182991 in words is "two hundred thirty-eight million, one hundred eighty-two thousand, nine hundred ninety-one".