6651261 has 8 divisors (see below), whose sum is σ = 9853760. Its totient is φ = 4434156.

The previous prime is 6651251. The next prime is 6651277. The reversal of 6651261 is 1621566.

It is a happy number.

6651261 is a `hidden beast` number, since 6 + 651 + 2 + 6 + 1 = 666.

It is not a de Polignac number, because 6651261 - 2⁷ = 6651133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 246343 = 6651261 / (6 + 6 + 5 + 1 + 2 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123145 + ... + 123198.

It is an arithmetic number, because the mean of its divisors is an integer number (1231720).

Almost surely, 2^6651261 is an apocalyptic number.

It is an amenable number.

6651261 is a deficient number, since it is larger than the sum of its proper divisors (3202499).

6651261 is a wasteful number, since it uses less digits than its factorization.

6651261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246352 (or 246346 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 6651261 is about 2579.0038774690. The cubic root of 6651261 is about 188.0621210886.

The spelling of 6651261 in words is "six million, six hundred fifty-one thousand, two hundred sixty-one".