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194810681 = 1318897933
BaseRepresentation
bin10111001110010…
…01001100111001
3111120120102000102
423213021030321
5344332420211
631155245145
74553602112
oct1347111471
9446512012
10194810681
119aa6916a
12552a97b5
133148b2c0
141bc31209
1512181a3b
hexb9c9339

194810681 has 8 divisors (see below), whose sum is σ = 209933640. Its totient is φ = 179707392.

The previous prime is 194810659. The next prime is 194810689. The reversal of 194810681 is 186018491.

It can be written as a sum of positive squares in 4 ways, for example, as 1155625 + 193655056 = 1075^2 + 13916^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 194810681 - 26 = 194810617 is a prime.

It is a super-2 number, since 2×1948106812 = 75902402863367522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194810689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20591 + ... + 28523.

It is an arithmetic number, because the mean of its divisors is an integer number (26241705).

Almost surely, 2194810681 is an apocalyptic number.

It is an amenable number.

194810681 is a deficient number, since it is larger than the sum of its proper divisors (15122959).

194810681 is a wasteful number, since it uses less digits than its factorization.

194810681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9835.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 194810681 is about 13957.4596900725. The cubic root of 194810681 is about 579.7012740328.

The spelling of 194810681 in words is "one hundred ninety-four million, eight hundred ten thousand, six hundred eighty-one".

Divisors: 1 13 1889 7933 24557 103129 14985437 194810681