91002 has 16 divisors (see below), whose sum is σ = 188640. Its totient is φ = 29232.

The previous prime is 90997. The next prime is 91009. The reversal of 91002 is 20019.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91009) by changing a digit.

91002 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88 + ... + 435.

It is an arithmetic number, because the mean of its divisors is an integer number (11790).

2⁹¹⁰⁰² is an apocalyptic number.

91002 is an abundant number, since it is smaller than the sum of its proper divisors (97638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94320).

91002 is a wasteful number, since it uses less digits than its factorization.

91002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 91002 is about 301.6653775295. The cubic root of 91002 is about 44.9797439699.

The spelling of 91002 in words is "ninety-one thousand, two".