2065551 has 16 divisors (see below), whose sum is σ = 2952288. Its totient is φ = 1280000.

The previous prime is 2065523. The next prime is 2065559. The reversal of 2065551 is 1555602.

It is a 11-Lehmer number, since φ(2065551) divides (2065551-1)¹¹.

It is a cyclic number.

It is not a de Polignac number, because 2065551 - 2¹⁰ = 2064527 is a prime.

2065551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2065559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4951 + ... + 5351.

It is an arithmetic number, because the mean of its divisors is an integer number (184518).

2^2065551 is an apocalyptic number.

2065551 is a deficient number, since it is larger than the sum of its proper divisors (886737).

2065551 is a wasteful number, since it uses less digits than its factorization.

2065551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 2065551 is about 1437.2024909525. The cubic root of 2065551 is about 127.3538193940.

It can be divided in two parts, 20655 and 51, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 2065551 in words is "two million, sixty-five thousand, five hundred fifty-one".