2571641 has 4 divisors (see below), whose sum is σ = 2722932. Its totient is φ = 2420352.

The previous prime is 2571619. The next prime is 2571649. The reversal of 2571641 is 1461752.

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 2325625 + 246016 = 1525^2 + 496^2 .

It is a cyclic number.

It is not a de Polignac number, because 2571641 - 2¹⁸ = 2309497 is a prime.

It is a super-2 number, since 2×2571641² = 13226674865762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2571641.

It is not an unprimeable number, because it can be changed into a prime (2571649) 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, 75620 + ... + 75653.

It is an arithmetic number, because the mean of its divisors is an integer number (680733).

2^2571641 is an apocalyptic number.

It is an amenable number.

2571641 is a deficient number, since it is larger than the sum of its proper divisors (151291).

2571641 is a wasteful number, since it uses less digits than its factorization.

2571641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151290.

The product of its digits is 1680, while the sum is 26.

The square root of 2571641 is about 1603.6336863511. The cubic root of 2571641 is about 137.0051146260.

The spelling of 2571641 in words is "two million, five hundred seventy-one thousand, six hundred forty-one".