69781009 has 4 divisors (see below), whose sum is σ = 70033204. Its totient is φ = 69528816.

The previous prime is 69780983. The next prime is 69781043. The reversal of 69781009 is 90018796.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42250000 + 27531009 = 6500^2 + 5247^2 .

It is a cyclic number.

It is not a de Polignac number, because 69781009 - 2⁷ = 69780881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69781079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125682 + ... + 126235.

It is an arithmetic number, because the mean of its divisors is an integer number (17508301).

Almost surely, 2^69781009 is an apocalyptic number.

It is an amenable number.

69781009 is a deficient number, since it is larger than the sum of its proper divisors (252195).

69781009 is a wasteful number, since it uses less digits than its factorization.

69781009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252194.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 69781009 is about 8353.5027982278. The cubic root of 69781009 is about 411.6983075077.

The spelling of 69781009 in words is "sixty-nine million, seven hundred eighty-one thousand, nine".