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2161297871 is a prime number
BaseRepresentation
bin1000000011010010…
…1100100111001111
312120121212022022022
42000310230213033
513411243012441
6554244040355
7104362504655
oct20064544717
95517768268
102161297871
11a09aa6097
125039930bb
13285a007a5
14167084dd5
15c9b2484b
hex80d2c9cf

2161297871 has 2 divisors, whose sum is σ = 2161297872. Its totient is φ = 2161297870.

The previous prime is 2161297849. The next prime is 2161297973. The reversal of 2161297871 is 1787921612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161297871 - 210 = 2161296847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161297841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080648935 + 1080648936.

It is an arithmetic number, because the mean of its divisors is an integer number (1080648936).

Almost surely, 22161297871 is an apocalyptic number.

2161297871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161297871 is an equidigital number, since it uses as much as digits as its factorization.

2161297871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 44.

The square root of 2161297871 is about 46489.7609264664. The cubic root of 2161297871 is about 1292.9196675793.

The spelling of 2161297871 in words is "two billion, one hundred sixty-one million, two hundred ninety-seven thousand, eight hundred seventy-one".