1931864069 has 2 divisors, whose sum is σ = 1931864070. Its totient is φ = 1931864068.

The previous prime is 1931864027. The next prime is 1931864141. The reversal of 1931864069 is 9604681391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1349607169 + 582256900 = 36737^2 + 24130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1931864069 - 2²⁴ = 1915086853 is a prime.

It is a super-2 number, since 2×1931864069² = 7464197562186473522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1931864009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965932034 + 965932035.

It is an arithmetic number, because the mean of its divisors is an integer number (965932035).

Almost surely, 2^1931864069 is an apocalyptic number.

It is an amenable number.

1931864069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1931864069 is an equidigital number, since it uses as much as digits as its factorization.

1931864069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1931864069 is about 43952.9756558074. The cubic root of 1931864069 is about 1245.4477766548.

The spelling of 1931864069 in words is "one billion, nine hundred thirty-one million, eight hundred sixty-four thousand, sixty-nine".