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20081051291 = 783184718713
BaseRepresentation
bin10010101100111011…
…001000011010011011
31220211111001002201102
4102230323020122123
5312111222120131
613120342342015
71310425056020
oct225473103233
956744032642
1020081051291
118575259064
123a8512a90b
131b80415692
14d86d83547
157c7e2b1cb
hex4acec869b

20081051291 has 16 divisors (see below), whose sum is σ = 23240093184. Its totient is φ = 16994837184.

The previous prime is 20081051281. The next prime is 20081051323. The reversal of 20081051291 is 19215018002.

It is a cyclic number.

It is not a de Polignac number, because 20081051291 - 214 = 20081034907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20081051231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1063751 + ... + 1082463.

It is an arithmetic number, because the mean of its divisors is an integer number (1452505824).

Almost surely, 220081051291 is an apocalyptic number.

20081051291 is a deficient number, since it is larger than the sum of its proper divisors (3159041893).

20081051291 is a wasteful number, since it uses less digits than its factorization.

20081051291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20650.

The product of its (nonzero) digits is 1440, while the sum is 29.

Adding to 20081051291 its reverse (19215018002), we get a palindrome (39296069293).

The spelling of 20081051291 in words is "twenty billion, eighty-one million, fifty-one thousand, two hundred ninety-one".

Divisors: 1 7 83 581 1847 12929 18713 130991 153301 1073107 1553179 10872253 34562911 241940377 2868721613 20081051291