2313781 has 4 divisors (see below), whose sum is σ = 2322412. Its totient is φ = 2305152.

The previous prime is 2313769. The next prime is 2313797. The reversal of 2313781 is 1873132.

2313781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 933156 + 1380625 = 966^2 + 1175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2313781 - 2⁷ = 2313653 is a prime.

It is a super-2 number, since 2×2313781² = 10707165031922, 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 (2353781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3900 + ... + 4453.

It is an arithmetic number, because the mean of its divisors is an integer number (580603).

2^2313781 is an apocalyptic number.

It is an amenable number.

2313781 is a deficient number, since it is larger than the sum of its proper divisors (8631).

2313781 is an equidigital number, since it uses as much as digits as its factorization.

2313781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8630.

The product of its digits is 1008, while the sum is 25.

The square root of 2313781 is about 1521.1117644670. Note that the first 3 decimals coincide. The cubic root of 2313781 is about 132.2637251203.

The spelling of 2313781 in words is "two million, three hundred thirteen thousand, seven hundred eighty-one".