6616531 has 2 divisors, whose sum is σ = 6616532. Its totient is φ = 6616530.

The previous prime is 6616529. The next prime is 6616537. The reversal of 6616531 is 1356166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6616531 - 2¹ = 6616529 is a prime.

It is a super-2 number, since 2×6616531² = 87556964947922, which contains 22 as substring.

Together with 6616529, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6616531.

It is not a weakly prime, because it can be changed into another prime (6616537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3308265 + 3308266.

It is an arithmetic number, because the mean of its divisors is an integer number (3308266).

Almost surely, 2^6616531 is an apocalyptic number.

6616531 is a deficient number, since it is larger than the sum of its proper divisors (1).

6616531 is an equidigital number, since it uses as much as digits as its factorization.

6616531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 6616531 is about 2572.2618451472. The cubic root of 6616531 is about 187.7342234364.

The spelling of 6616531 in words is "six million, six hundred sixteen thousand, five hundred thirty-one".