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81201194 = 253766049
BaseRepresentation
bin1001101011100…
…00100000101010
312122210110002122
410311300200222
5131241414234
612020231242
72004125114
oct465604052
9178713078
1081201194
1141921728
122323b522
1313a91059
14aada3b4
1571de92e
hex4d7082a

81201194 has 8 divisors (see below), whose sum is σ = 124100100. Its totient is φ = 39834496.

The previous prime is 81201191. The next prime is 81201223. The reversal of 81201194 is 49110218.

It can be written as a sum of positive squares in 2 ways, for example, as 79477225 + 1723969 = 8915^2 + 1313^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81201191) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 382919 + ... + 383130.

Almost surely, 281201194 is an apocalyptic number.

81201194 is a deficient number, since it is larger than the sum of its proper divisors (42898906).

81201194 is a wasteful number, since it uses less digits than its factorization.

81201194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766104.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 81201194 is about 9011.1705122032. The cubic root of 81201194 is about 433.0328118831.

The spelling of 81201194 in words is "eighty-one million, two hundred one thousand, one hundred ninety-four".

Divisors: 1 2 53 106 766049 1532098 40600597 81201194