6542689 has 2 divisors, whose sum is σ = 6542690. Its totient is φ = 6542688.

The previous prime is 6542681. The next prime is 6542693. The reversal of 6542689 is 9862456.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5475600 + 1067089 = 2340^2 + 1033^2 .

It is a cyclic number.

It is not a de Polignac number, because 6542689 - 2³ = 6542681 is a prime.

It is a super-3 number, since 3×6542689³ (a number of 21 digits) contains 333 as substring.

6542689 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6542681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271344 + 3271345.

It is an arithmetic number, because the mean of its divisors is an integer number (3271345).

Almost surely, 2^6542689 is an apocalyptic number.

It is an amenable number.

6542689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6542689 is an equidigital number, since it uses as much as digits as its factorization.

6542689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 6542689 is about 2557.8680575823. The cubic root of 6542689 is about 187.0332235287.

The spelling of 6542689 in words is "six million, five hundred forty-two thousand, six hundred eighty-nine".