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30161 is a prime number
BaseRepresentation
bin111010111010001
31112101002
413113101
51431121
6351345
7153635
oct72721
945332
1030161
112072a
1215555
1310961
14adc5
158e0b
hex75d1

30161 has 2 divisors, whose sum is σ = 30162. Its totient is φ = 30160.

The previous prime is 30139. The next prime is 30169. The reversal of 30161 is 16103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28561 + 1600 = 169^2 + 40^2 .

It is an emirp because it is prime and its reverse (16103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30161 - 26 = 30097 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (30169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15080 + 15081.

It is an arithmetic number, because the mean of its divisors is an integer number (15081).

230161 is an apocalyptic number.

It is an amenable number.

30161 is a deficient number, since it is larger than the sum of its proper divisors (1).

30161 is an equidigital number, since it uses as much as digits as its factorization.

30161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 30161 is about 173.6692258289. The cubic root of 30161 is about 31.1278108567.

Adding to 30161 its reverse (16103), we get a palindrome (46264).

It can be divided in two parts, 30 and 161, that added together give a palindrome (191).

The spelling of 30161 in words is "thirty thousand, one hundred sixty-one".