2061851 has 4 divisors (see below), whose sum is σ = 2249304. Its totient is φ = 1874400.

The previous prime is 2061847. The next prime is 2061869. The reversal of 2061851 is 1581602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2061851 - 2² = 2061847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2061551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93710 + ... + 93731.

It is an arithmetic number, because the mean of its divisors is an integer number (562326).

2^2061851 is an apocalyptic number.

2061851 is a deficient number, since it is larger than the sum of its proper divisors (187453).

2061851 is a wasteful number, since it uses less digits than its factorization.

2061851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187452.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2061851 is about 1435.9146910593. The cubic root of 2061851 is about 127.2777314204.

Subtracting from 2061851 its reverse (1581602), we obtain a square (480249 = 693²).

The spelling of 2061851 in words is "two million, sixty-one thousand, eight hundred fifty-one".