385131 has 4 divisors (see below), whose sum is σ = 513512. Its totient is φ = 256752.

The previous prime is 385129. The next prime is 385139. The reversal of 385131 is 131583.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 385131 - 2¹ = 385129 is a prime.

It is a super-2 number, since 2×385131² = 296651774322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 385098 and 385107.

It is not an unprimeable number, because it can be changed into a prime (385139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64186 + ... + 64191.

It is an arithmetic number, because the mean of its divisors is an integer number (128378).

2³⁸⁵¹³¹ is an apocalyptic number.

385131 is a deficient number, since it is larger than the sum of its proper divisors (128381).

385131 is a wasteful number, since it uses less digits than its factorization.

385131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128380.

The product of its digits is 360, while the sum is 21.

The square root of 385131 is about 620.5892361297. The cubic root of 385131 is about 72.7561136086.

The spelling of 385131 in words is "three hundred eighty-five thousand, one hundred thirty-one".