Search a number
-
+
90109 = 251359
BaseRepresentation
bin10101111111111101
311120121101
4111333331
510340414
61533101
7523465
oct257775
9146541
1090109
1161778
1244191
1332026
1424ba5
151ba74
hex15ffd

90109 has 4 divisors (see below), whose sum is σ = 90720. Its totient is φ = 89500.

The previous prime is 90107. The next prime is 90121.

90109 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 90109 - 21 = 90107 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90107) 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, 72 + ... + 430.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

290109 is an apocalyptic number.

It is an amenable number.

90109 is a deficient number, since it is larger than the sum of its proper divisors (611).

90109 is a wasteful number, since it uses less digits than its factorization.

90109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610.

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 90109 is about 300.1816116953. The cubic root of 90109 is about 44.8321317638.

The spelling of 90109 in words is "ninety thousand, one hundred nine".

Divisors: 1 251 359 90109