69891009 has 16 divisors (see below), whose sum is σ = 94556160. Its totient is φ = 45914960.

The previous prime is 69890999. The next prime is 69891013. The reversal of 69891009 is 90019896.

It is a cyclic number.

It is not a de Polignac number, because 69891009 - 2⁹ = 69890497 is a prime.

69891009 is a Rhonda number in base 16.

It is not an unprimeable number, because it can be changed into a prime (69891049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76264 + ... + 77174.

It is an arithmetic number, because the mean of its divisors is an integer number (5909760).

Almost surely, 2^69891009 is an apocalyptic number.

It is an amenable number.

69891009 is a deficient number, since it is larger than the sum of its proper divisors (24665151).

69891009 is a wasteful number, since it uses less digits than its factorization.

69891009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 69891009 is about 8360.0842699102. The cubic root of 69891009 is about 411.9145222018.

The spelling of 69891009 in words is "sixty-nine million, eight hundred ninety-one thousand, nine".