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81134930 = 2514835471
BaseRepresentation
bin1001101011000…
…00010101010010
312122200002012102
410311200111102
5131232304210
612015000402
72003430662
oct465402522
9178602172
1081134930
1141886968
1223209102
1313a69b46
14aac01a2
1571c9ea5
hex4d60552

81134930 has 16 divisors (see below), whose sum is σ = 146168064. Its totient is φ = 32426160.

The previous prime is 81134927. The next prime is 81134947. The reversal of 81134930 is 3943118.

It is a super-2 number, since 2×811349302 = 13165753732209800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81134893 and 81134902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12095 + ... + 17565.

It is an arithmetic number, because the mean of its divisors is an integer number (9135504).

Almost surely, 281134930 is an apocalyptic number.

81134930 is a deficient number, since it is larger than the sum of its proper divisors (65033134).

81134930 is a wasteful number, since it uses less digits than its factorization.

81134930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6961.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 81134930 is about 9007.4929919484. The cubic root of 81134930 is about 432.9149881019.

The spelling of 81134930 in words is "eighty-one million, one hundred thirty-four thousand, nine hundred thirty".

Divisors: 1 2 5 10 1483 2966 5471 7415 10942 14830 27355 54710 8113493 16226986 40567465 81134930