6541690 has 8 divisors (see below), whose sum is σ = 11775060. Its totient is φ = 2616672.

The previous prime is 6541687. The next prime is 6541693. The reversal of 6541690 is 961456.

It is an interprime number because it is at equal distance from previous prime (6541687) and next prime (6541693).

It can be written as a sum of positive squares in 2 ways, for example, as 5870929 + 670761 = 2423^2 + 819^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6541690² = 85587416112200, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (6541693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327075 + ... + 327094.

Almost surely, 2^6541690 is an apocalyptic number.

6541690 is a deficient number, since it is larger than the sum of its proper divisors (5233370).

6541690 is a wasteful number, since it uses less digits than its factorization.

6541690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654176.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 6541690 is about 2557.6727703129. The cubic root of 6541690 is about 187.0237037069.

It can be divided in two parts, 6 and 541690, that added together give a square (541696 = 736²).

The spelling of 6541690 in words is "six million, five hundred forty-one thousand, six hundred ninety".