6540081 has 4 divisors (see below), whose sum is σ = 8720112. Its totient is φ = 4360052.

The previous prime is 6540067. The next prime is 6540103. The reversal of 6540081 is 1800456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6540081 - 2¹⁵ = 6507313 is a prime.

It is a super-2 number, since 2×6540081² = 85545318973122, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6540181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090011 + ... + 1090016.

It is an arithmetic number, because the mean of its divisors is an integer number (2180028).

Almost surely, 2^6540081 is an apocalyptic number.

It is an amenable number.

6540081 is a deficient number, since it is larger than the sum of its proper divisors (2180031).

6540081 is a wasteful number, since it uses less digits than its factorization.

6540081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180030.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 6540081 is about 2557.3582072131. The cubic root of 6540081 is about 187.0083689430.

The spelling of 6540081 in words is "six million, five hundred forty thousand, eighty-one".