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812381917 = 1960171143
BaseRepresentation
bin110000011010111…
…111011011011101
32002121122021111011
4300122333123131
53130432210132
6212340055221
726063063254
oct6032773335
92077567434
10812381917
11387628616
121a8094511
13cc3c9979
1479c6d79b
154b4c0b47
hex306bf6dd

812381917 has 8 divisors (see below), whose sum is σ = 856573760. Its totient is φ = 768333600.

The previous prime is 812381903. The next prime is 812381971. The reversal of 812381917 is 719183218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-812381917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 812381917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812381117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24153 + ... + 46990.

It is an arithmetic number, because the mean of its divisors is an integer number (107071720).

Almost surely, 2812381917 is an apocalyptic number.

It is an amenable number.

812381917 is a deficient number, since it is larger than the sum of its proper divisors (44191843).

812381917 is a wasteful number, since it uses less digits than its factorization.

812381917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71763.

The product of its digits is 24192, while the sum is 40.

The square root of 812381917 is about 28502.3142393736. The cubic root of 812381917 is about 933.0825822845.

The spelling of 812381917 in words is "eight hundred twelve million, three hundred eighty-one thousand, nine hundred seventeen".

Divisors: 1 19 601 11419 71143 1351717 42756943 812381917