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145649 = 720807
BaseRepresentation
bin100011100011110001
321101210102
4203203301
514130044
63042145
71144430
oct434361
9241712
10145649
119a479
1270355
13513aa
143b117
152d24e
hex238f1

145649 has 4 divisors (see below), whose sum is σ = 166464. Its totient is φ = 124836.

The previous prime is 145643. The next prime is 145661. The reversal of 145649 is 946541.

145649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 946541 = 1635807.

It is a cyclic number.

It is not a de Polignac number, because 145649 - 24 = 145633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145643) 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, 10397 + ... + 10410.

It is an arithmetic number, because the mean of its divisors is an integer number (41616).

2145649 is an apocalyptic number.

It is an amenable number.

145649 is a deficient number, since it is larger than the sum of its proper divisors (20815).

145649 is an equidigital number, since it uses as much as digits as its factorization.

145649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20814.

The product of its digits is 4320, while the sum is 29.

The square root of 145649 is about 381.6398826119. The cubic root of 145649 is about 52.6141431894.

The spelling of 145649 in words is "one hundred forty-five thousand, six hundred forty-nine".

Divisors: 1 7 20807 145649