2009695823 has 2 divisors, whose sum is σ = 2009695824. Its totient is φ = 2009695822.

The previous prime is 2009695801. The next prime is 2009695843. The reversal of 2009695823 is 3285969002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2009695823 - 2¹² = 2009691727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2009695843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004847911 + 1004847912.

It is an arithmetic number, because the mean of its divisors is an integer number (1004847912).

Almost surely, 2^2009695823 is an apocalyptic number.

2009695823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009695823 is an equidigital number, since it uses as much as digits as its factorization.

2009695823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 2009695823 is about 44829.6310825775. The cubic root of 2009695823 is about 1261.9537638682.

The spelling of 2009695823 in words is "two billion, nine million, six hundred ninety-five thousand, eight hundred twenty-three".