1043431661 has 4 divisors (see below), whose sum is σ = 1104810012. Its totient is φ = 982053312.

The previous prime is 1043431621. The next prime is 1043431667. The reversal of 1043431661 is 1661343401.

1043431661 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.

It can be written as a sum of positive squares in 2 ways, for example, as 529276036 + 514155625 = 23006^2 + 22675^2 .

It is a cyclic number.

It is not a de Polignac number, because 1043431661 - 2¹⁰ = 1043430637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1043431667) 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, 30689150 + ... + 30689183.

It is an arithmetic number, because the mean of its divisors is an integer number (276202503).

Almost surely, 2^1043431661 is an apocalyptic number.

It is an amenable number.

1043431661 is a deficient number, since it is larger than the sum of its proper divisors (61378351).

1043431661 is an equidigital number, since it uses as much as digits as its factorization.

1043431661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61378350.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1043431661 is about 32302.1928203025. The cubic root of 1043431661 is about 1014.2725456419.

The spelling of 1043431661 in words is "one billion, forty-three million, four hundred thirty-one thousand, six hundred sixty-one".