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155321 = 1271223
BaseRepresentation
bin100101111010111001
321220001122
4211322321
514432241
63155025
71214555
oct457271
9256048
10155321
11a6771
1275a75
135590a
1440865
153104b
hex25eb9

155321 has 4 divisors (see below), whose sum is σ = 156672. Its totient is φ = 153972.

The previous prime is 155317. The next prime is 155327. The reversal of 155321 is 123551.

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.

It is a cyclic number.

It is not a de Polignac number, because 155321 - 22 = 155317 is a prime.

It is a super-2 number, since 2×1553212 = 48249226082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155321.

It is not an unprimeable number, because it can be changed into a prime (155327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485 + ... + 738.

It is an arithmetic number, because the mean of its divisors is an integer number (39168).

2155321 is an apocalyptic number.

It is an amenable number.

155321 is a deficient number, since it is larger than the sum of its proper divisors (1351).

155321 is a wasteful number, since it uses less digits than its factorization.

155321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350.

The product of its digits is 150, while the sum is 17.

The square root of 155321 is about 394.1078532585. The cubic root of 155321 is about 53.7539099373.

Adding to 155321 its reverse (123551), we get a palindrome (278872).

The spelling of 155321 in words is "one hundred fifty-five thousand, three hundred twenty-one".

Divisors: 1 127 1223 155321