2231765 has 4 divisors (see below), whose sum is σ = 2678124. Its totient is φ = 1785408.

The previous prime is 2231737. The next prime is 2231767. The reversal of 2231765 is 5671322.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5671322 = 2 ⋅2835661.

It can be written as a sum of positive squares in 2 ways, for example, as 357604 + 1874161 = 598^2 + 1369^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231765 - 2¹² = 2227669 is a prime.

It is a super-3 number, since 3×2231765³ = 33347758055560866375, which contains 333 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 (2231767) 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, 223172 + ... + 223181.

It is an arithmetic number, because the mean of its divisors is an integer number (669531).

2^2231765 is an apocalyptic number.

It is an amenable number.

2231765 is a deficient number, since it is larger than the sum of its proper divisors (446359).

2231765 is an equidigital number, since it uses as much as digits as its factorization.

2231765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446358.

The product of its digits is 2520, while the sum is 26.

The square root of 2231765 is about 1493.9093011291. The cubic root of 2231765 is about 130.6821148553.

The spelling of 2231765 in words is "two million, two hundred thirty-one thousand, seven hundred sixty-five".