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134809921 = 1997193379
BaseRepresentation
bin10000000100100…
…00100101000001
3100101200001110001
420002100211001
5234002404141
621213240001
73224602561
oct1002204501
9311601401
10134809921
116a107764
1239193001
1321c10bac
1413c92da1
15bc7da31
hex8090941

134809921 has 16 divisors (see below), whose sum is σ = 144491200. Its totient is φ = 125411328.

The previous prime is 134809919. The next prime is 134809957. The reversal of 134809921 is 129908431.

It is a 3-Lehmer number, since φ(134809921) divides (134809921-1)3.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 134809921 - 21 = 134809919 is a prime.

It is a deceptive number, since it divides R134809920.

It is not an unprimeable number, because it can be changed into a prime (134809721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355510 + ... + 355888.

It is an arithmetic number, because the mean of its divisors is an integer number (9030700).

It is a Poulet number, since it divides 2134809920-1.

Almost surely, 2134809921 is an apocalyptic number.

It is an amenable number.

134809921 is a deficient number, since it is larger than the sum of its proper divisors (9681279).

134809921 is a wasteful number, since it uses less digits than its factorization.

134809921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 134809921 is about 11610.7674595610. The cubic root of 134809921 is about 512.7519075702.

The spelling of 134809921 in words is "one hundred thirty-four million, eight hundred nine thousand, nine hundred twenty-one".

Divisors: 1 19 97 193 379 1843 3667 7201 18721 36763 73147 355699 698497 1389793 7095259 134809921