385115231 has 2 divisors, whose sum is σ = 385115232. Its totient is φ = 385115230.

The previous prime is 385115219. The next prime is 385115233. The reversal of 385115231 is 132511583.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 385115231 - 2¹⁰ = 385114207 is a prime.

It is a super-2 number, since 2×385115231² = 296627482296366722, which contains 22 as substring.

Together with 385115233, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_20584226 and since 385115231 and 20584226 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 385115194 and 385115203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385115233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192557615 + 192557616.

It is an arithmetic number, because the mean of its divisors is an integer number (192557616).

Almost surely, 2^385115231 is an apocalyptic number.

385115231 is a deficient number, since it is larger than the sum of its proper divisors (1).

385115231 is an equidigital number, since it uses as much as digits as its factorization.

385115231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The square root of 385115231 is about 19624.3530084434. The cubic root of 385115231 is about 727.5512060728.

The spelling of 385115231 in words is "three hundred eighty-five million, one hundred fifteen thousand, two hundred thirty-one".