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61409 is a prime number
BaseRepresentation
bin1110111111100001
310010020102
432333201
53431114
61152145
7344015
oct167741
9103212
1061409
1142157
122b655
1321c4a
1418545
15132de
hexefe1

61409 has 2 divisors, whose sum is σ = 61410. Its totient is φ = 61408.

The previous prime is 61403. The next prime is 61417. The reversal of 61409 is 90416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61009 + 400 = 247^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 61409 - 28 = 61153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61403) 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, 30704 + 30705.

It is an arithmetic number, because the mean of its divisors is an integer number (30705).

261409 is an apocalyptic number.

It is an amenable number.

61409 is a deficient number, since it is larger than the sum of its proper divisors (1).

61409 is an equidigital number, since it uses as much as digits as its factorization.

61409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 61409 is about 247.8083937239. The cubic root of 61409 is about 39.4527555646.

The spelling of 61409 in words is "sixty-one thousand, four hundred nine".