90861 has 8 divisors (see below), whose sum is σ = 125184. Its totient is φ = 58560.

The previous prime is 90847. The next prime is 90863. The reversal of 90861 is 16809.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90861 - 2¹¹ = 88813 is a prime.

90861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396 + ... + 581.

It is an arithmetic number, because the mean of its divisors is an integer number (15648).

2⁹⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

90861 is a deficient number, since it is larger than the sum of its proper divisors (34323).

90861 is a wasteful number, since it uses less digits than its factorization.

90861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 90861 is about 301.4315842774. The cubic root of 90861 is about 44.9565011757.

It can be divided in two parts, 908 and 61, that added together give a palindrome (969).

The spelling of 90861 in words is "ninety thousand, eight hundred sixty-one".