6664531 has 2 divisors, whose sum is σ = 6664532. Its totient is φ = 6664530.

The previous prime is 6664529. The next prime is 6664543. The reversal of 6664531 is 1354666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6664531 - 2¹ = 6664529 is a prime.

It is a super-2 number, since 2×6664531² = 88831946899922, which contains 22 as substring.

Together with 6664529, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6664493 and 6664502.

It is not a weakly prime, because it can be changed into another prime (6664501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332265 + 3332266.

It is an arithmetic number, because the mean of its divisors is an integer number (3332266).

Almost surely, 2^6664531 is an apocalyptic number.

6664531 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664531 is an equidigital number, since it uses as much as digits as its factorization.

6664531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 6664531 is about 2581.5752942729. The cubic root of 6664531 is about 188.1871062370.

The spelling of 6664531 in words is "six million, six hundred sixty-four thousand, five hundred thirty-one".