389531 has 2 divisors, whose sum is σ = 389532. Its totient is φ = 389530.

The previous prime is 389527. The next prime is 389533. The reversal of 389531 is 135983.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 389531 - 2² = 389527 is a prime.

It is a super-2 number, since 2×389531² = 303468799922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 389533, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 389494 and 389503.

It is not a weakly prime, because it can be changed into another prime (389533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194765 + 194766.

It is an arithmetic number, because the mean of its divisors is an integer number (194766).

2³⁸⁹⁵³¹ is an apocalyptic number.

389531 is a deficient number, since it is larger than the sum of its proper divisors (1).

389531 is an equidigital number, since it uses as much as digits as its factorization.

389531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 389531 is about 624.1241863604. The cubic root of 389531 is about 73.0321369730.

The spelling of 389531 in words is "three hundred eighty-nine thousand, five hundred thirty-one".