1661433 has 4 divisors (see below), whose sum is σ = 2215248. Its totient is φ = 1107620.

The previous prime is 1661431. The next prime is 1661437. The reversal of 1661433 is 3341661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3341661 = 3 ⋅1113887.

It is a cyclic number.

It is not a de Polignac number, because 1661433 - 2¹ = 1661431 is a prime.

It is a super-2 number, since 2×1661433² = 5520719226978, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1661431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276903 + ... + 276908.

It is an arithmetic number, because the mean of its divisors is an integer number (553812).

2^1661433 is an apocalyptic number.

It is an amenable number.

1661433 is a deficient number, since it is larger than the sum of its proper divisors (553815).

1661433 is an equidigital number, since it uses as much as digits as its factorization.

1661433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553814.

The product of its digits is 1296, while the sum is 24.

The square root of 1661433 is about 1288.9658645596. The cubic root of 1661433 is about 118.4388760593.

The spelling of 1661433 in words is "one million, six hundred sixty-one thousand, four hundred thirty-three".