2057521 has 4 divisors (see below), whose sum is σ = 2128500. Its totient is φ = 1986544.

The previous prime is 2057483. The next prime is 2057537. The reversal of 2057521 is 1257502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1311025 + 746496 = 1145^2 + 864^2 .

It is a cyclic number.

It is not a de Polignac number, because 2057521 - 2⁹ = 2057009 is a prime.

It is a Duffinian number.

2057521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2057492 and 2057501.

It is not an unprimeable number, because it can be changed into a prime (2057021) 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, 35446 + ... + 35503.

It is an arithmetic number, because the mean of its divisors is an integer number (532125).

2^2057521 is an apocalyptic number.

It is an amenable number.

2057521 is a deficient number, since it is larger than the sum of its proper divisors (70979).

2057521 is an equidigital number, since it uses as much as digits as its factorization.

2057521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70978.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 2057521 is about 1434.4061488993. The cubic root of 2057521 is about 127.1885722431.

The spelling of 2057521 in words is "two million, fifty-seven thousand, five hundred twenty-one".