70565009 has 2 divisors, whose sum is σ = 70565010. Its totient is φ = 70565008.

The previous prime is 70564999. The next prime is 70565039. The reversal of 70565009 is 90056507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63123025 + 7441984 = 7945^2 + 2728^2 .

It is an emirp because it is prime and its reverse (90056507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70565009 - 2¹² = 70560913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (70565039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35282504 + 35282505.

It is an arithmetic number, because the mean of its divisors is an integer number (35282505).

Almost surely, 2^70565009 is an apocalyptic number.

It is an amenable number.

70565009 is a deficient number, since it is larger than the sum of its proper divisors (1).

70565009 is an equidigital number, since it uses as much as digits as its factorization.

70565009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 70565009 is about 8400.2981494706. The cubic root of 70565009 is about 413.2343995930.

The spelling of 70565009 in words is "seventy million, five hundred sixty-five thousand, nine".