2315661 has 4 divisors (see below), whose sum is σ = 3087552. Its totient is φ = 1543772.

The previous prime is 2315659. The next prime is 2315683. The reversal of 2315661 is 1665132.

2315661 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, 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 2315661 - 2¹ = 2315659 is a prime.

It is a D-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 (2315611) 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, 385941 + ... + 385946.

It is an arithmetic number, because the mean of its divisors is an integer number (771888).

2^2315661 is an apocalyptic number.

It is an amenable number.

2315661 is a deficient number, since it is larger than the sum of its proper divisors (771891).

2315661 is an equidigital number, since it uses as much as digits as its factorization.

2315661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771890.

The product of its digits is 1080, while the sum is 24.

The square root of 2315661 is about 1521.7296080447. The cubic root of 2315661 is about 132.2995378567.

The spelling of 2315661 in words is "two million, three hundred fifteen thousand, six hundred sixty-one".