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181920113 is a prime number
BaseRepresentation
bin10101101011111…
…10000101110001
3110200022111110222
422311332011301
5333032420423
630015102425
74336203224
oct1265760561
9420274428
10181920113
1193764301
1250b11a15
132b8c6b4b
141a2375bb
1510e873c8
hexad7e171

181920113 has 2 divisors, whose sum is σ = 181920114. Its totient is φ = 181920112.

The previous prime is 181920107. The next prime is 181920149. The reversal of 181920113 is 311029181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180821809 + 1098304 = 13447^2 + 1048^2 .

It is an emirp because it is prime and its reverse (311029181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181920113 - 26 = 181920049 is a prime.

It is not a weakly prime, because it can be changed into another prime (181920413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90960056 + 90960057.

It is an arithmetic number, because the mean of its divisors is an integer number (90960057).

Almost surely, 2181920113 is an apocalyptic number.

It is an amenable number.

181920113 is a deficient number, since it is larger than the sum of its proper divisors (1).

181920113 is an equidigital number, since it uses as much as digits as its factorization.

181920113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 181920113 is about 13487.7764290486. The cubic root of 181920113 is about 566.6221822442.

Adding to 181920113 its reverse (311029181), we get a palindrome (492949294).

The spelling of 181920113 in words is "one hundred eighty-one million, nine hundred twenty thousand, one hundred thirteen".