6687497 has 2 divisors, whose sum is σ = 6687498. Its totient is φ = 6687496.

The previous prime is 6687463. The next prime is 6687521. The reversal of 6687497 is 7947866.

It is a happy number.

6687497 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6497401 + 190096 = 2549^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 6687497 - 2¹² = 6683401 is a prime.

It is a super-2 number, since 2×6687497² = 89445232250018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6687427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343748 + 3343749.

It is an arithmetic number, because the mean of its divisors is an integer number (3343749).

Almost surely, 2^6687497 is an apocalyptic number.

It is an amenable number.

6687497 is a deficient number, since it is larger than the sum of its proper divisors (1).

6687497 is an equidigital number, since it uses as much as digits as its factorization.

6687497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 6687497 is about 2586.0195281552. The cubic root of 6687497 is about 188.4030229124.

The spelling of 6687497 in words is "six million, six hundred eighty-seven thousand, four hundred ninety-seven".