2051550 has 72 divisors (see below), whose sum is σ = 5687136. Its totient is φ = 529920.

The previous prime is 2051537. The next prime is 2051587. The reversal of 2051550 is 551502.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21102 + ... + 21198.

It is an arithmetic number, because the mean of its divisors is an integer number (78988).

2^2051550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2051550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2843568).

2051550 is an abundant number, since it is smaller than the sum of its proper divisors (3635586).

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

2051550 is a wasteful number, since it uses less digits than its factorization.

2051550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 2051550 is about 1432.3232875297. The cubic root of 2051550 is about 127.0654177617.

It can be divided in two parts, 2051 and 550, that added together give a square (2601 = 51²).

The spelling of 2051550 in words is "two million, fifty-one thousand, five hundred fifty".