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545891309 = 1153473453
BaseRepresentation
bin100000100010011…
…010001111101101
31102001012011002122
4200202122033231
52104222010214
6130100202325
716345666565
oct4042321755
91361164078
10545891309
11260161247
121329993a5
1389132312
14526ddda5
1532dd088e
hex2089a3ed

545891309 has 4 divisors (see below), whose sum is σ = 546365916. Its totient is φ = 545416704.

The previous prime is 545891287. The next prime is 545891317. The reversal of 545891309 is 903198545.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 236236900 + 309654409 = 15370^2 + 17597^2 .

It is a cyclic number.

It is not a de Polignac number, because 545891309 - 220 = 544842733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 545891309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545891509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235574 + ... + 237879.

It is an arithmetic number, because the mean of its divisors is an integer number (136591479).

Almost surely, 2545891309 is an apocalyptic number.

It is an amenable number.

545891309 is a deficient number, since it is larger than the sum of its proper divisors (474607).

545891309 is a wasteful number, since it uses less digits than its factorization.

545891309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474606.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 545891309 is about 23364.3170026432. The cubic root of 545891309 is about 817.2759642581.

The spelling of 545891309 in words is "five hundred forty-five million, eight hundred ninety-one thousand, three hundred nine".

Divisors: 1 1153 473453 545891309