1020247909 has 2 divisors, whose sum is σ = 1020247910. Its totient is φ = 1020247908.

The previous prime is 1020247903. The next prime is 1020247937. The reversal of 1020247909 is 9097420201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 552391009 + 467856900 = 23503^2 + 21630^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020247909 - 2²³ = 1011859301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020247903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510123954 + 510123955.

It is an arithmetic number, because the mean of its divisors is an integer number (510123955).

Almost surely, 2^1020247909 is an apocalyptic number.

It is an amenable number.

1020247909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020247909 is an equidigital number, since it uses as much as digits as its factorization.

1020247909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1020247909 is about 31941.3197754883. The cubic root of 1020247909 is about 1006.7042555125.

The spelling of 1020247909 in words is "one billion, twenty million, two hundred forty-seven thousand, nine hundred nine".