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165140561 is a prime number
BaseRepresentation
bin10011101011111…
…01100001010001
3102111202000021002
421311331201101
5314233444221
624215311345
74043446235
oct1165754121
9374660232
10165140561
1185243603
124737b555
13282a0511
1417d0a5c5
15e77080b
hex9d7d851

165140561 has 2 divisors, whose sum is σ = 165140562. Its totient is φ = 165140560.

The previous prime is 165140543. The next prime is 165140581. The reversal of 165140561 is 165041561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164968336 + 172225 = 12844^2 + 415^2 .

It is an emirp because it is prime and its reverse (165041561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165140561 - 210 = 165139537 is a prime.

It is not a weakly prime, because it can be changed into another prime (165140501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82570280 + 82570281.

It is an arithmetic number, because the mean of its divisors is an integer number (82570281).

Almost surely, 2165140561 is an apocalyptic number.

It is an amenable number.

165140561 is a deficient number, since it is larger than the sum of its proper divisors (1).

165140561 is an equidigital number, since it uses as much as digits as its factorization.

165140561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 165140561 is about 12850.7027434300. The cubic root of 165140561 is about 548.6363584912.

The spelling of 165140561 in words is "one hundred sixty-five million, one hundred forty thousand, five hundred sixty-one".