659531 has 2 divisors, whose sum is σ = 659532. Its totient is φ = 659530.

The previous prime is 659521. The next prime is 659539. The reversal of 659531 is 135956.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 659531 - 2⁶ = 659467 is a prime.

It is a super-2 number, since 2×659531² = 869962279922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 659494 and 659503.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 659531.

It is not a weakly prime, because it can be changed into another prime (659539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329765 + 329766.

It is an arithmetic number, because the mean of its divisors is an integer number (329766).

2⁶⁵⁹⁵³¹ is an apocalyptic number.

659531 is a deficient number, since it is larger than the sum of its proper divisors (1).

659531 is an equidigital number, since it uses as much as digits as its factorization.

659531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 29.

The square root of 659531 is about 812.1151396200. The cubic root of 659531 is about 87.0452488449.

The spelling of 659531 in words is "six hundred fifty-nine thousand, five hundred thirty-one".