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125009 = 413049
BaseRepresentation
bin11110100001010001
320100110222
4132201101
513000014
62402425
71030313
oct364121
9210428
10125009
1185a15
1260415
1344b91
14337b3
152708e
hex1e851

125009 has 4 divisors (see below), whose sum is σ = 128100. Its totient is φ = 121920.

The previous prime is 125003. The next prime is 125017. The reversal of 125009 is 900521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900521 = 7911399.

It can be written as a sum of positive squares in 2 ways, for example, as 9409 + 115600 = 97^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 125009 - 28 = 124753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125003) 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, 1484 + ... + 1565.

It is an arithmetic number, because the mean of its divisors is an integer number (32025).

125009 is a Friedman number, since it can be written as 50^(2+1+0)+9, using all its digits and the basic arithmetic operations.

2125009 is an apocalyptic number.

It is an amenable number.

125009 is a deficient number, since it is larger than the sum of its proper divisors (3091).

125009 is an equidigital number, since it uses as much as digits as its factorization.

125009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3090.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 125009 is about 353.5661182862. The cubic root of 125009 is about 50.0011999712.

The spelling of 125009 in words is "one hundred twenty-five thousand, nine".

Divisors: 1 41 3049 125009