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1664661 = 3554887
BaseRepresentation
bin110010110011010010101
310010120111010
412112122111
5411232121
655402433
720102145
oct6263225
93116433
101664661
11a37759
12683419
1346390b
14314925
1522d376
hex196695

1664661 has 4 divisors (see below), whose sum is σ = 2219552. Its totient is φ = 1109772.

The previous prime is 1664653. The next prime is 1664681.

1664661 is nontrivially palindromic in base 10.

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 not a de Polignac number, because 1664661 - 23 = 1664653 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277441 + ... + 277446.

It is an arithmetic number, because the mean of its divisors is an integer number (554888).

21664661 is an apocalyptic number.

It is an amenable number.

1664661 is a deficient number, since it is larger than the sum of its proper divisors (554891).

1664661 is an equidigital number, since it uses as much as digits as its factorization.

1664661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554890.

The product of its digits is 5184, while the sum is 30.

The square root of 1664661 is about 1290.2174235376. The cubic root of 1664661 is about 118.5155314436.

The spelling of 1664661 in words is "one million, six hundred sixty-four thousand, six hundred sixty-one".

Divisors: 1 3 554887 1664661