6540651 has 12 divisors (see below), whose sum is σ = 10174528. Its totient is φ = 4024944.

The previous prime is 6540643. The next prime is 6540673. The reversal of 6540651 is 1560456.

It is a happy number.

6540651 is a `hidden beast` number, since 6 + 5 + 4 + 0 + 651 = 666.

It is not a de Polignac number, because 6540651 - 2³ = 6540643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6540691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27835 + ... + 28068.

Almost surely, 2^6540651 is an apocalyptic number.

6540651 is a deficient number, since it is larger than the sum of its proper divisors (3633877).

6540651 is a wasteful number, since it uses less digits than its factorization.

6540651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55922 (or 55919 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 6540651 is about 2557.4696479137. The cubic root of 6540651 is about 187.0138016828.

The spelling of 6540651 in words is "six million, five hundred forty thousand, six hundred fifty-one".