2001550 has 12 divisors (see below), whose sum is σ = 3722976. Its totient is φ = 800600.

The previous prime is 2001547. The next prime is 2001553. The reversal of 2001550 is 551002.

2001550 = 89² + 90² + ... + 188².

It is an interprime number because it is at equal distance from previous prime (2001547) and next prime (2001553).

It is a self number, because there is not a number n which added to its sum of digits gives 2001550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19966 + ... + 20065.

It is an arithmetic number, because the mean of its divisors is an integer number (310248).

2^2001550 is an apocalyptic number.

2001550 is a deficient number, since it is larger than the sum of its proper divisors (1721426).

2001550 is a wasteful number, since it uses less digits than its factorization.

2001550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40043 (or 40038 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 2001550 is about 1414.7614639931. The cubic root of 2001550 is about 126.0246445453.

Adding to 2001550 its reverse (551002), we get a palindrome (2552552).

The spelling of 2001550 in words is "two million, one thousand, five hundred fifty".