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2105531161 is a prime number
BaseRepresentation
bin111110101111111…
…1101101100011001
312102201221001202121
41331133331230121
513303003444121
6544532501241
7103114501546
oct17537755431
95381831677
102105531161
119905767a8
124a917a821
132772a6636
1415d8c9bcd
15c4cab141
hex7d7fdb19

2105531161 has 2 divisors, whose sum is σ = 2105531162. Its totient is φ = 2105531160.

The previous prime is 2105531137. The next prime is 2105531173. The reversal of 2105531161 is 1611355012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2099380761 + 6150400 = 45819^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105531161 - 29 = 2105530649 is a prime.

It is a super-2 number, since 2×21055311612 = 8866522939884015842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2105541161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052765580 + 1052765581.

It is an arithmetic number, because the mean of its divisors is an integer number (1052765581).

Almost surely, 22105531161 is an apocalyptic number.

It is an amenable number.

2105531161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105531161 is an equidigital number, since it uses as much as digits as its factorization.

2105531161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 2105531161 is about 45886.0671773034. The cubic root of 2105531161 is about 1281.7024792628.

Adding to 2105531161 its reverse (1611355012), we get a palindrome (3716886173).

The spelling of 2105531161 in words is "two billion, one hundred five million, five hundred thirty-one thousand, one hundred sixty-one".