2051571 has 4 divisors (see below), whose sum is σ = 2735432. Its totient is φ = 1367712.

The previous prime is 2051537. The next prime is 2051587. The reversal of 2051571 is 1751502.

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

It is not a de Polignac number, because 2051571 - 2⁶ = 2051507 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2051171) 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, 341926 + ... + 341931.

It is an arithmetic number, because the mean of its divisors is an integer number (683858).

2^2051571 is an apocalyptic number.

2051571 is a deficient number, since it is larger than the sum of its proper divisors (683861).

2051571 is an equidigital number, since it uses as much as digits as its factorization.

2051571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683860.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 2051571 is about 1432.3306182582. The cubic root of 2051571 is about 127.0658513144.

The spelling of 2051571 in words is "two million, fifty-one thousand, five hundred seventy-one".