1969591091 has 12 divisors (see below), whose sum is σ = 2238615792. Its totient is φ = 1722391344.

The previous prime is 1969591073. The next prime is 1969591121. The reversal of 1969591091 is 1901959691.

It is not a de Polignac number, because 1969591091 - 2¹⁰ = 1969590067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1969591031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205151 + ... + 214536.

It is an arithmetic number, because the mean of its divisors is an integer number (186551316).

Almost surely, 2^1969591091 is an apocalyptic number.

1969591091 is a deficient number, since it is larger than the sum of its proper divisors (269024701).

1969591091 is a wasteful number, since it uses less digits than its factorization.

1969591091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419738 (or 419719 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 50.

The square root of 1969591091 is about 44380.0753829914. The cubic root of 1969591091 is about 1253.5029404369.

The spelling of 1969591091 in words is "one billion, nine hundred sixty-nine million, five hundred ninety-one thousand, ninety-one".