90215 has 4 divisors (see below), whose sum is σ = 108264. Its totient is φ = 72168.

The previous prime is 90203. The next prime is 90217. The reversal of 90215 is 51209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51209 = 41 ⋅1249.

It is a cyclic number.

It is not a de Polignac number, because 90215 - 2⁴ = 90199 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 90193 and 90202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90217) 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, 9017 + ... + 9026.

It is an arithmetic number, because the mean of its divisors is an integer number (27066).

2⁹⁰²¹⁵ is an apocalyptic number.

90215 is a deficient number, since it is larger than the sum of its proper divisors (18049).

90215 is a wasteful number, since it uses less digits than its factorization.

90215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18048.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 90215 is about 300.3581195839. The cubic root of 90215 is about 44.8497043472.

It can be divided in two parts, 902 and 15, that multiplied together give a triangular number (13530 = T₁₆₄).

The spelling of 90215 in words is "ninety thousand, two hundred fifteen".