1043661 has 4 divisors (see below), whose sum is σ = 1391552. Its totient is φ = 695772.

The previous prime is 1043657. The next prime is 1043663. The reversal of 1043661 is 1663401.

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: 1663401 = 3 ⋅554467.

It is not a de Polignac number, because 1043661 - 2² = 1043657 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1043663) 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, 173941 + ... + 173946.

It is an arithmetic number, because the mean of its divisors is an integer number (347888).

2^1043661 is an apocalyptic number.

It is an amenable number.

1043661 is a deficient number, since it is larger than the sum of its proper divisors (347891).

1043661 is an equidigital number, since it uses as much as digits as its factorization.

1043661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347890.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1043661 is about 1021.5972787748. The cubic root of 1043661 is about 101.4346850208.

The spelling of 1043661 in words is "one million, forty-three thousand, six hundred sixty-one".