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81083313 = 3213765761
BaseRepresentation
bin1001101010100…
…11101110110001
312122120110101200
410311103232301
5131224131223
612013521413
72003124333
oct465235661
9178513350
1081083313
1141851103
12231a3269
1313a4c4bc
14aaa9453
1571b9a43
hex4d53bb1

81083313 has 12 divisors (see below), whose sum is σ = 117977028. Its totient is φ = 53660160.

The previous prime is 81083297. The next prime is 81083323. The reversal of 81083313 is 31338018.

It can be written as a sum of positive squares in 2 ways, for example, as 68359824 + 12723489 = 8268^2 + 3567^2 .

It is not a de Polignac number, because 81083313 - 24 = 81083297 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81083323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31648 + ... + 34113.

It is an arithmetic number, because the mean of its divisors is an integer number (9831419).

Almost surely, 281083313 is an apocalyptic number.

It is an amenable number.

81083313 is a deficient number, since it is larger than the sum of its proper divisors (36893715).

81083313 is a wasteful number, since it uses less digits than its factorization.

81083313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65904 (or 65901 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81083313 is about 9004.6273104443. The cubic root of 81083313 is about 432.8231636423.

The spelling of 81083313 in words is "eighty-one million, eighty-three thousand, three hundred thirteen".

Divisors: 1 3 9 137 411 1233 65761 197283 591849 9009257 27027771 81083313