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2154661 = 972229
BaseRepresentation
bin1000001110000010100101
311001110122021
420032002211
51022422121
6114103141
724212545
oct10160245
94043567
102154661
111241913
1287aab1
135a5962
14401325
152c8641
hex20e0a5

2154661 has 6 divisors (see below), whose sum is σ = 2186610. Its totient is φ = 2123136.

The previous prime is 2154643. The next prime is 2154667. The reversal of 2154661 is 1664512.

It can be written as a sum of positive squares in 3 ways, for example, as 690561 + 1464100 = 831^2 + 1210^2 .

It is not a de Polignac number, because 2154661 - 25 = 2154629 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 (2154667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9295 + ... + 9523.

It is an arithmetic number, because the mean of its divisors is an integer number (364435).

22154661 is an apocalyptic number.

It is an amenable number.

2154661 is a deficient number, since it is larger than the sum of its proper divisors (31949).

2154661 is an frugal number, since it uses more digits than its factorization.

2154661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 326 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 2154661 is about 1467.8763571909. The cubic root of 2154661 is about 129.1594886519.

The spelling of 2154661 in words is "two million, one hundred fifty-four thousand, six hundred sixty-one".

Divisors: 1 97 229 9409 22213 2154661