2661571 has 16 divisors (see below), whose sum is σ = 3155328. Its totient is φ = 2217600.

The previous prime is 2661569. The next prime is 2661611. The reversal of 2661571 is 1751662.

It is not a de Polignac number, because 2661571 - 2¹ = 2661569 is a prime.

2661571 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7876 + ... + 8206.

It is an arithmetic number, because the mean of its divisors is an integer number (197208).

2^2661571 is an apocalyptic number.

2661571 is a deficient number, since it is larger than the sum of its proper divisors (493757).

2661571 is a wasteful number, since it uses less digits than its factorization.

2661571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402.

The product of its digits is 2520, while the sum is 28.

The square root of 2661571 is about 1631.4321928907. The cubic root of 2661571 is about 138.5838701004.

Subtracting from 2661571 its reverse (1751662), we obtain a palindrome (909909).

The spelling of 2661571 in words is "two million, six hundred sixty-one thousand, five hundred seventy-one".