6540881 has 4 divisors (see below), whose sum is σ = 6592512. Its totient is φ = 6489252.

The previous prime is 6540871. The next prime is 6540893. The reversal of 6540881 is 1880456.

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 a de Polignac number, because none of the positive numbers 2^k-6540881 is a prime.

It is a super-2 number, since 2×6540881² = 85566248512322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540841) 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, 25625 + ... + 25878.

It is an arithmetic number, because the mean of its divisors is an integer number (1648128).

Almost surely, 2^6540881 is an apocalyptic number.

It is an amenable number.

6540881 is a deficient number, since it is larger than the sum of its proper divisors (51631).

6540881 is a wasteful number, since it uses less digits than its factorization.

6540881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51630.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 6540881 is about 2557.5146138390. The cubic root of 6540881 is about 187.0159937515.

The spelling of 6540881 in words is "six million, five hundred forty thousand, eight hundred eighty-one".