1591002 has 80 divisors (see below), whose sum is σ = 4321152. Its totient is φ = 427680.

The previous prime is 1591001. The next prime is 1591021. The reversal of 1591002 is 2001951.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 3.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 26052 + ... + 26112.

2^1591002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1591002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2160576).

1591002 is an abundant number, since it is smaller than the sum of its proper divisors (2730150).

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

1591002 is a wasteful number, since it uses less digits than its factorization.

1591002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1591002 is about 1261.3492775596. The cubic root of 1591002 is about 116.7410446356.

Adding to 1591002 its reverse (2001951), we get a palindrome (3592953).

The spelling of 1591002 in words is "one million, five hundred ninety-one thousand, two".