6615491 has 2 divisors, whose sum is σ = 6615492. Its totient is φ = 6615490.

The previous prime is 6615487. The next prime is 6615503. The reversal of 6615491 is 1945166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6615491 - 2² = 6615487 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6611491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3307745 + 3307746.

It is an arithmetic number, because the mean of its divisors is an integer number (3307746).

Almost surely, 2^6615491 is an apocalyptic number.

6615491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6615491 is an equidigital number, since it uses as much as digits as its factorization.

6615491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 6615491 is about 2572.0596804895. The cubic root of 6615491 is about 187.7243867700.

The spelling of 6615491 in words is "six million, six hundred fifteen thousand, four hundred ninety-one".