2311540261 has 4 divisors (see below), whose sum is σ = 2312252800. Its totient is φ = 2310827724.

The previous prime is 2311540249. The next prime is 2311540333. The reversal of 2311540261 is 1620451132.

It is a happy number.

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 not a de Polignac number, because 2311540261 - 2¹¹ = 2311538213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311540211) 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, 351381 + ... + 357898.

It is an arithmetic number, because the mean of its divisors is an integer number (578063200).

Almost surely, 2^2311540261 is an apocalyptic number.

It is an amenable number.

2311540261 is a deficient number, since it is larger than the sum of its proper divisors (712539).

2311540261 is an equidigital number, since it uses as much as digits as its factorization.

2311540261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712538.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2311540261 is about 48078.4802276445. The cubic root of 2311540261 is about 1322.2101519948.

Adding to 2311540261 its reverse (1620451132), we get a palindrome (3931991393).

The spelling of 2311540261 in words is "two billion, three hundred eleven million, five hundred forty thousand, two hundred sixty-one".