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68654521 = 135281117
BaseRepresentation
bin1000001011110…
…01010110111001
311210012000022001
410011321112321
5120033421041
610451301001
71462360645
oct405712671
9153160261
1068654521
1135832181
121abaa761
13112ba2a0
149191c25
156062131
hex41795b9

68654521 has 4 divisors (see below), whose sum is σ = 73935652. Its totient is φ = 63373392.

The previous prime is 68654503. The next prime is 68654527. The reversal of 68654521 is 12545686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30647296 + 38007225 = 5536^2 + 6165^2 .

It is a cyclic number.

It is not a de Polignac number, because 68654521 - 25 = 68654489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68654527) 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, 2640546 + ... + 2640571.

It is an arithmetic number, because the mean of its divisors is an integer number (18483913).

Almost surely, 268654521 is an apocalyptic number.

It is an amenable number.

68654521 is a deficient number, since it is larger than the sum of its proper divisors (5281131).

68654521 is a wasteful number, since it uses less digits than its factorization.

68654521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5281130.

The product of its digits is 57600, while the sum is 37.

The square root of 68654521 is about 8285.8023751475. The cubic root of 68654521 is about 409.4709038639.

The spelling of 68654521 in words is "sixty-eight million, six hundred fifty-four thousand, five hundred twenty-one".

Divisors: 1 13 5281117 68654521