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6621661 = 531011237
BaseRepresentation
bin11001010000100111011101
3110110102012201
4121100213131
53143343121
6353531501
7110166064
oct31204735
913412181
106621661
113812a52
122273b91
1314aac57
14c451db
158abe91
hex6509dd

6621661 has 8 divisors (see below), whose sum is σ = 6818904. Its totient is φ = 6427200.

The previous prime is 6621649. The next prime is 6621691. The reversal of 6621661 is 1661266.

It can be written as a sum of positive squares in 4 ways, for example, as 4280761 + 2340900 = 2069^2 + 1530^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6621661 - 27 = 6621533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621691) 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, 4735 + ... + 5971.

It is an arithmetic number, because the mean of its divisors is an integer number (852363).

Almost surely, 26621661 is an apocalyptic number.

It is an amenable number.

6621661 is a deficient number, since it is larger than the sum of its proper divisors (197243).

6621661 is a wasteful number, since it uses less digits than its factorization.

6621661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391.

The product of its digits is 2592, while the sum is 28.

The square root of 6621661 is about 2573.2588288006. The cubic root of 6621661 is about 187.7827296084.

The spelling of 6621661 in words is "six million, six hundred twenty-one thousand, six hundred sixty-one".

Divisors: 1 53 101 1237 5353 65561 124937 6621661