667531 has 2 divisors, whose sum is σ = 667532. Its totient is φ = 667530.

The previous prime is 667519. The next prime is 667547. The reversal of 667531 is 135766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667531 - 2⁹ = 667019 is a prime.

It is a super-2 number, since 2×667531² = 891195271922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667531.

It is not a weakly prime, because it can be changed into another prime (667501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333765 + 333766.

It is an arithmetic number, because the mean of its divisors is an integer number (333766).

2⁶⁶⁷⁵³¹ is an apocalyptic number.

667531 is a deficient number, since it is larger than the sum of its proper divisors (1).

667531 is an equidigital number, since it uses as much as digits as its factorization.

667531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 28.

The square root of 667531 is about 817.0257033900. The cubic root of 667531 is about 87.3957834054.

The spelling of 667531 in words is "six hundred sixty-seven thousand, five hundred thirty-one".