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90191 is a prime number
BaseRepresentation
bin10110000001001111
311120201102
4112001033
510341231
61533315
7523643
oct260117
9146642
1090191
1161842
124423b
133208a
1424c23
151bacb
hex1604f

90191 has 2 divisors, whose sum is σ = 90192. Its totient is φ = 90190.

The previous prime is 90187. The next prime is 90197. The reversal of 90191 is 19109.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90191 - 22 = 90187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45095 + 45096.

It is an arithmetic number, because the mean of its divisors is an integer number (45096).

290191 is an apocalyptic number.

90191 is a deficient number, since it is larger than the sum of its proper divisors (1).

90191 is an equidigital number, since it uses as much as digits as its factorization.

90191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 90191 is about 300.3181646188. The cubic root of 90191 is about 44.8457268550.

The spelling of 90191 in words is "ninety thousand, one hundred ninety-one".