2571247 has 4 divisors (see below), whose sum is σ = 2938576. Its totient is φ = 2203920.

The previous prime is 2571209. The next prime is 2571269. The reversal of 2571247 is 7421752.

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

It is a cyclic number.

It is not a de Polignac number, because 2571247 - 2⁷ = 2571119 is a prime.

It is a super-2 number, since 2×2571247² = 13222622270018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2571277) 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, 183654 + ... + 183667.

It is an arithmetic number, because the mean of its divisors is an integer number (734644).

2^2571247 is an apocalyptic number.

2571247 is a deficient number, since it is larger than the sum of its proper divisors (367329).

2571247 is an equidigital number, since it uses as much as digits as its factorization.

2571247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367328.

The product of its digits is 3920, while the sum is 28.

The square root of 2571247 is about 1603.5108356354. The cubic root of 2571247 is about 136.9981174373.

Adding to 2571247 its reverse (7421752), we get a palindrome (9992999).

The spelling of 2571247 in words is "two million, five hundred seventy-one thousand, two hundred forty-seven".