1040431121 has 4 divisors (see below), whose sum is σ = 1042475700. Its totient is φ = 1038386544.

The previous prime is 1040431111. The next prime is 1040431153. The reversal of 1040431121 is 1211340401.

It is a happy number.

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 597118096 + 443313025 = 24436^2 + 21055^2 .

It is a cyclic number.

It is not a de Polignac number, because 1040431121 - 2¹⁸ = 1040168977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1040431121.

It is not an unprimeable number, because it can be changed into a prime (1040431111) 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, 1021526 + ... + 1022543.

It is an arithmetic number, because the mean of its divisors is an integer number (260618925).

Almost surely, 2^1040431121 is an apocalyptic number.

It is an amenable number.

1040431121 is a deficient number, since it is larger than the sum of its proper divisors (2044579).

1040431121 is an equidigital number, since it uses as much as digits as its factorization.

1040431121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044578.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1040431121 is about 32255.7145479681. The cubic root of 1040431121 is about 1013.2993826513.

Adding to 1040431121 its reverse (1211340401), we get a palindrome (2251771522).

The spelling of 1040431121 in words is "one billion, forty million, four hundred thirty-one thousand, one hundred twenty-one".