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81610243 = 11131932957
BaseRepresentation
bin1001101110101…
…00011000000011
312200120020012121
410313110120003
5131343011433
612033105111
72010450511
oct467243003
9180506177
1081610243
1142080a90
12233b8197
1313ba52b0
14aba54b1
157270c2d
hex4dd4603

81610243 has 16 divisors (see below), whose sum is σ = 96407136. Its totient is φ = 68106240.

The previous prime is 81610237. The next prime is 81610247. The reversal of 81610243 is 34201618.

It is a cyclic number.

It is not a de Polignac number, because 81610243 - 25 = 81610211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81610247) 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, 26121 + ... + 29077.

It is an arithmetic number, because the mean of its divisors is an integer number (6025446).

Almost surely, 281610243 is an apocalyptic number.

81610243 is a deficient number, since it is larger than the sum of its proper divisors (14796893).

81610243 is a wasteful number, since it uses less digits than its factorization.

81610243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 81610243 is about 9033.8387742974. The cubic root of 81610243 is about 433.7587250028.

The spelling of 81610243 in words is "eighty-one million, six hundred ten thousand, two hundred forty-three".

Divisors: 1 11 13 143 193 2123 2509 2957 27599 32527 38441 422851 570701 6277711 7419113 81610243