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81723841 = 791034479
BaseRepresentation
bin1001101111100…
…00000111000001
312200210000000221
410313300013001
5131410130331
612035343041
72011432633
oct467600701
9180700027
1081723841
1142149371
1223451a81
1313c14c04
14abd4a53
157294711
hex4df01c1

81723841 has 4 divisors (see below), whose sum is σ = 82758400. Its totient is φ = 80689284.

The previous prime is 81723839. The next prime is 81723857. The reversal of 81723841 is 14832718.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81723841 - 21 = 81723839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81723797 and 81723806.

It is not an unprimeable number, because it can be changed into a prime (81723821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517161 + ... + 517318.

It is an arithmetic number, because the mean of its divisors is an integer number (20689600).

Almost surely, 281723841 is an apocalyptic number.

It is an amenable number.

81723841 is a deficient number, since it is larger than the sum of its proper divisors (1034559).

81723841 is a wasteful number, since it uses less digits than its factorization.

81723841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034558.

The product of its digits is 10752, while the sum is 34.

The square root of 81723841 is about 9040.1239482653. The cubic root of 81723841 is about 433.9598896157.

The spelling of 81723841 in words is "eighty-one million, seven hundred twenty-three thousand, eight hundred forty-one".

Divisors: 1 79 1034479 81723841