1020423409 has 2 divisors, whose sum is σ = 1020423410. Its totient is φ = 1020423408.

The previous prime is 1020423379. The next prime is 1020423449. The reversal of 1020423409 is 9043240201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 786241600 + 234181809 = 28040^2 + 15303^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020423409 - 2⁷ = 1020423281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020423449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510211704 + 510211705.

It is an arithmetic number, because the mean of its divisors is an integer number (510211705).

Almost surely, 2^1020423409 is an apocalyptic number.

It is an amenable number.

1020423409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020423409 is an equidigital number, since it uses as much as digits as its factorization.

1020423409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1020423409 is about 31944.0668825997. The cubic root of 1020423409 is about 1006.7619756234.

The spelling of 1020423409 in words is "one billion, twenty million, four hundred twenty-three thousand, four hundred nine".