2571997 has 4 divisors (see below), whose sum is σ = 2582496. Its totient is φ = 2561500.

The previous prime is 2571979. The next prime is 2572001. The reversal of 2571997 is 7991752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2571997 is a prime.

It is a Duffinian number.

2571997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2571937) 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, 4873 + ... + 5374.

It is an arithmetic number, because the mean of its divisors is an integer number (645624).

2^2571997 is an apocalyptic number.

It is an amenable number.

2571997 is a deficient number, since it is larger than the sum of its proper divisors (10499).

2571997 is a wasteful number, since it uses less digits than its factorization.

2571997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10498.

The product of its digits is 39690, while the sum is 40.

The square root of 2571997 is about 1603.7446804277. The cubic root of 2571997 is about 137.0114363444.

The spelling of 2571997 in words is "two million, five hundred seventy-one thousand, nine hundred ninety-seven".