Search a number
-
+
155131 = 532927
BaseRepresentation
bin100101110111111011
321212210121
4211313323
514431011
63154111
71214164
oct456773
9255717
10155131
11a6609
1275937
13557c2
144076b
1530e71
hex25dfb

155131 has 4 divisors (see below), whose sum is σ = 158112. Its totient is φ = 152152.

The previous prime is 155119. The next prime is 155137. The reversal of 155131 is 131551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131551 = 718793.

It is a cyclic number.

It is not a de Polignac number, because 155131 - 27 = 155003 is a prime.

It is a super-2 number, since 2×1551312 = 48131254322, which contains 22 as substring.

It is a Duffinian number.

155131 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (155137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1411 + ... + 1516.

It is an arithmetic number, because the mean of its divisors is an integer number (39528).

2155131 is an apocalyptic number.

155131 is a deficient number, since it is larger than the sum of its proper divisors (2981).

155131 is an equidigital number, since it uses as much as digits as its factorization.

155131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980.

The product of its digits is 75, while the sum is 16.

The square root of 155131 is about 393.8667287294. The cubic root of 155131 is about 53.7319824232.

Adding to 155131 its reverse (131551), we get a palindrome (286682).

The spelling of 155131 in words is "one hundred fifty-five thousand, one hundred thirty-one".

Divisors: 1 53 2927 155131