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677561 is a prime number
BaseRepresentation
bin10100101011010111001
31021102102212
42211122321
5133140221
622304505
75521253
oct2453271
91242385
10677561
11423075
12288135
131a9531
14138cd3
15d5b5b
hexa56b9

677561 has 2 divisors, whose sum is σ = 677562. Its totient is φ = 677560.

The previous prime is 677543. The next prime is 677563. The reversal of 677561 is 165776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 609961 + 67600 = 781^2 + 260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-677561 is a prime.

Together with 677563, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (677563) 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 as a sum of consecutive naturals, namely, 338780 + 338781.

It is an arithmetic number, because the mean of its divisors is an integer number (338781).

2677561 is an apocalyptic number.

It is an amenable number.

677561 is a deficient number, since it is larger than the sum of its proper divisors (1).

677561 is an equidigital number, since it uses as much as digits as its factorization.

677561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 32.

The square root of 677561 is about 823.1409356848. The cubic root of 677561 is about 87.8313315362.

The spelling of 677561 in words is "six hundred seventy-seven thousand, five hundred sixty-one".