1665231 has 4 divisors (see below), whose sum is σ = 2220312. Its totient is φ = 1110152.

The previous prime is 1665221. The next prime is 1665233. The reversal of 1665231 is 1325661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1325661 = 3 ⋅441887.

It is a cyclic number.

It is not a de Polignac number, because 1665231 - 2¹¹ = 1663183 is a prime.

It is a super-2 number, since 2×1665231² = 5545988566722, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665233) 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, 277536 + ... + 277541.

It is an arithmetic number, because the mean of its divisors is an integer number (555078).

2^1665231 is an apocalyptic number.

1665231 is a deficient number, since it is larger than the sum of its proper divisors (555081).

1665231 is an equidigital number, since it uses as much as digits as its factorization.

1665231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555080.

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

The square root of 1665231 is about 1290.4382976338. The cubic root of 1665231 is about 118.5290569490.

The spelling of 1665231 in words is "one million, six hundred sixty-five thousand, two hundred thirty-one".