6691457 has 2 divisors, whose sum is σ = 6691458. Its totient is φ = 6691456.

The previous prime is 6691427. The next prime is 6691463. The reversal of 6691457 is 7541966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6330256 + 361201 = 2516^2 + 601^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691457 - 2¹⁰ = 6690433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6691457.

It is not a weakly prime, because it can be changed into another prime (6691427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345728 + 3345729.

It is an arithmetic number, because the mean of its divisors is an integer number (3345729).

Almost surely, 2^6691457 is an apocalyptic number.

It is an amenable number.

6691457 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691457 is an equidigital number, since it uses as much as digits as its factorization.

6691457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The square root of 6691457 is about 2586.7850703141. The cubic root of 6691457 is about 188.4402031786.

The spelling of 6691457 in words is "six million, six hundred ninety-one thousand, four hundred fifty-seven".