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81078081 = 3729313177
BaseRepresentation
bin1001101010100…
…10011101000001
312122120012012220
410311102131001
5131223444311
612013441253
72003103150
oct465223501
9178505186
1081078081
1141848187
12231a0229
1313a49cc6
14aaa7597
1571b8206
hex4d52741

81078081 has 16 divisors (see below), whose sum is σ = 123978624. Its totient is φ = 46168704.

The previous prime is 81078079. The next prime is 81078131. The reversal of 81078081 is 18087018.

It is not a de Polignac number, because 81078081 - 21 = 81078079 is a prime.

It is a super-2 number, since 2×810780812 = 13147310437285122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81078001) 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, 436 + ... + 12741.

It is an arithmetic number, because the mean of its divisors is an integer number (7748664).

Almost surely, 281078081 is an apocalyptic number.

It is an amenable number.

81078081 is a deficient number, since it is larger than the sum of its proper divisors (42900543).

81078081 is a wasteful number, since it uses less digits than its factorization.

81078081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13480.

The product of its (nonzero) digits is 3584, while the sum is 33.

The square root of 81078081 is about 9004.3367884592. The cubic root of 81078081 is about 432.8138539606.

The spelling of 81078081 in words is "eighty-one million, seventy-eight thousand, eighty-one".

Divisors: 1 3 7 21 293 879 2051 6153 13177 39531 92239 276717 3860861 11582583 27026027 81078081