1591506 has 48 divisors (see below), whose sum is σ = 4178304. Its totient is φ = 427392.

The previous prime is 1591487. The next prime is 1591507. The reversal of 1591506 is 6051951.

1591506 is a `hidden beast` number, since 159 + 1 + 506 = 666.

It is a super-3 number, since 3×1591506³ = 12093335333242146648, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1591506.

It is not an unprimeable number, because it can be changed into a prime (1591507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1771 + ... + 2513.

It is an arithmetic number, because the mean of its divisors is an integer number (87048).

2^1591506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1591506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2089152).

1591506 is an abundant number, since it is smaller than the sum of its proper divisors (2586798).

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

1591506 is a wasteful number, since it uses less digits than its factorization.

1591506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775 (or 772 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 1591506 is about 1261.5490477980. The cubic root of 1591506 is about 116.7533704685.

The spelling of 1591506 in words is "one million, five hundred ninety-one thousand, five hundred six".