385531 has 2 divisors, whose sum is σ = 385532. Its totient is φ = 385530.

The previous prime is 385519. The next prime is 385537. The reversal of 385531 is 135583.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 385531 - 2⁷ = 385403 is a prime.

It is a super-2 number, since 2×385531² = 297268303922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 385496 and 385505.

It is not a weakly prime, because it can be changed into another prime (385537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192765 + 192766.

It is an arithmetic number, because the mean of its divisors is an integer number (192766).

2³⁸⁵⁵³¹ is an apocalyptic number.

385531 is a deficient number, since it is larger than the sum of its proper divisors (1).

385531 is an equidigital number, since it uses as much as digits as its factorization.

385531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 385531 is about 620.9114268557. The cubic root of 385531 is about 72.7812932453.

The spelling of 385531 in words is "three hundred eighty-five thousand, five hundred thirty-one".