90911 has 2 divisors, whose sum is σ = 90912. Its totient is φ = 90910.
The previous prime is 90907. The next prime is 90917. The reversal of 90911 is 11909.
It is a weak prime.
It is an emirp because it is prime and its reverse (11909) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 90911 - 22 = 90907 is a prime.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (90917) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45455 + 45456.
It is an arithmetic number, because the mean of its divisors is an integer number (45456).
290911 is an apocalyptic number.
90911 is a deficient number, since it is larger than the sum of its proper divisors (1).
90911 is an equidigital number, since it uses as much as digits as its factorization.
90911 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 90911 is about 301.5145104303. The cubic root of 90911 is about 44.9647460511.
It can be divided in two parts, 909 and 11, that multiplied together give a palindrome (9999).
The spelling of 90911 in words is "ninety thousand, nine hundred eleven".
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