1020019409 has 2 divisors, whose sum is σ = 1020019410. Its totient is φ = 1020019408.

The previous prime is 1020019331. The next prime is 1020019411. The reversal of 1020019409 is 9049100201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 735928384 + 284091025 = 27128^2 + 16855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020019409 - 2¹² = 1020015313 is a prime.

Together with 1020019411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1020019309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510009704 + 510009705.

It is an arithmetic number, because the mean of its divisors is an integer number (510009705).

Almost surely, 2^1020019409 is an apocalyptic number.

It is an amenable number.

1020019409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020019409 is an equidigital number, since it uses as much as digits as its factorization.

1020019409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1020019409 is about 31937.7427035788. The cubic root of 1020019409 is about 1006.6290943367.

The spelling of 1020019409 in words is "one billion, twenty million, nineteen thousand, four hundred nine".