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91061 = 412221
BaseRepresentation
bin10110001110110101
311121220122
4112032311
510403221
61541325
7526325
oct261665
9147818
1091061
1162463
1244845
13325a9
1425285
151beab
hex163b5

91061 has 4 divisors (see below), whose sum is σ = 93324. Its totient is φ = 88800.

The previous prime is 91033. The next prime is 91079. The reversal of 91061 is 16019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16019 = 83193.

It can be written as a sum of positive squares in 2 ways, for example, as 28561 + 62500 = 169^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 91061 - 26 = 90997 is a prime.

It is a house number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91081) 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, 1070 + ... + 1151.

It is an arithmetic number, because the mean of its divisors is an integer number (23331).

291061 is an apocalyptic number.

It is an amenable number.

91061 is a deficient number, since it is larger than the sum of its proper divisors (2263).

91061 is a wasteful number, since it uses less digits than its factorization.

91061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2262.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 91061 is about 301.7631521574. The cubic root of 91061 is about 44.9894625533.

The spelling of 91061 in words is "ninety-one thousand, sixty-one".

Divisors: 1 41 2221 91061