2661311 has 4 divisors (see below), whose sum is σ = 2801400. Its totient is φ = 2521224.

The previous prime is 2661283. The next prime is 2661317. The reversal of 2661311 is 1131662.

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

It is not a de Polignac number, because 2661311 - 2¹⁴ = 2644927 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661317) 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, 70016 + ... + 70053.

It is an arithmetic number, because the mean of its divisors is an integer number (700350).

2^2661311 is an apocalyptic number.

2661311 is a deficient number, since it is larger than the sum of its proper divisors (140089).

2661311 is a wasteful number, since it uses less digits than its factorization.

2661311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140088.

The product of its digits is 216, while the sum is 20.

The square root of 2661311 is about 1631.3525063578. The cubic root of 2661311 is about 138.5793573547.

Adding to 2661311 its reverse (1131662), we get a palindrome (3792973).

The spelling of 2661311 in words is "two million, six hundred sixty-one thousand, three hundred eleven".