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155281 = 723169
BaseRepresentation
bin100101111010010001
321220000011
4211322101
514432111
63154521
71214500
oct457221
9256004
10155281
11a6735
1275a41
13558a9
1440837
1531021
hex25e91

155281 has 6 divisors (see below), whose sum is σ = 180690. Its totient is φ = 133056.

The previous prime is 155269. The next prime is 155291. The reversal of 155281 is 182551.

155281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 148225 + 7056 = 385^2 + 84^2 .

It is not a de Polignac number, because 155281 - 27 = 155153 is a prime.

It is a super-2 number, since 2×1552812 = 48224377922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1536 + ... + 1633.

It is an arithmetic number, because the mean of its divisors is an integer number (30115).

2155281 is an apocalyptic number.

It is an amenable number.

155281 is a deficient number, since it is larger than the sum of its proper divisors (25409).

155281 is an equidigital number, since it uses as much as digits as its factorization.

155281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3183 (or 3176 counting only the distinct ones).

The product of its digits is 400, while the sum is 22.

The square root of 155281 is about 394.0571024611. The cubic root of 155281 is about 53.7492951052.

The spelling of 155281 in words is "one hundred fifty-five thousand, two hundred eighty-one".

Divisors: 1 7 49 3169 22183 155281