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42091 = 72859
BaseRepresentation
bin1010010001101011
32010201221
422101223
52321331
6522511
7233500
oct122153
963657
1042091
1129695
1220437
131620a
14114a7
15c711
hexa46b

42091 has 6 divisors (see below), whose sum is σ = 49020. Its totient is φ = 36036.

The previous prime is 42089. The next prime is 42101. The reversal of 42091 is 19024.

42091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42091 - 21 = 42089 is a prime.

It is a Duffinian number.

42091 is a lucky number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (42061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 381 + ... + 478.

It is an arithmetic number, because the mean of its divisors is an integer number (8170).

242091 is an apocalyptic number.

42091 is a deficient number, since it is larger than the sum of its proper divisors (6929).

42091 is an equidigital number, since it uses as much as digits as its factorization.

42091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 42091 is about 205.1609124565. The cubic root of 42091 is about 34.7853529764.

The spelling of 42091 in words is "forty-two thousand, ninety-one".

Divisors: 1 7 49 859 6013 42091