1023431729 has 4 divisors (see below), whose sum is σ = 1051092084. Its totient is φ = 995771376.

The previous prime is 1023431723. The next prime is 1023431741. The reversal of 1023431729 is 9271343201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9271343201 = 65629 ⋅141269.

It can be written as a sum of positive squares in 2 ways, for example, as 851297329 + 172134400 = 29177^2 + 13120^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023431729 - 2⁸ = 1023431473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1023431695 and 1023431704.

It is not an unprimeable number, because it can be changed into a prime (1023431723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13830122 + ... + 13830195.

It is an arithmetic number, because the mean of its divisors is an integer number (262773021).

Almost surely, 2^1023431729 is an apocalyptic number.

It is an amenable number.

1023431729 is a deficient number, since it is larger than the sum of its proper divisors (27660355).

1023431729 is an equidigital number, since it uses as much as digits as its factorization.

1023431729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27660354.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 1023431729 is about 31991.1195333955. The cubic root of 1023431729 is about 1007.7503531763.

The spelling of 1023431729 in words is "one billion, twenty-three million, four hundred thirty-one thousand, seven hundred twenty-nine".