1191020893 has 2 divisors, whose sum is σ = 1191020894. Its totient is φ = 1191020892.

The previous prime is 1191020879. The next prime is 1191021043. The reversal of 1191020893 is 3980201911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1174227289 + 16793604 = 34267^2 + 4098^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191020893 - 2²⁹ = 654149981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191020693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595510446 + 595510447.

It is an arithmetic number, because the mean of its divisors is an integer number (595510447).

Almost surely, 2^1191020893 is an apocalyptic number.

It is an amenable number.

1191020893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191020893 is an equidigital number, since it uses as much as digits as its factorization.

1191020893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1191020893 is about 34511.1705538946. The cubic root of 1191020893 is about 1060.0014515822.

The spelling of 1191020893 in words is "one billion, one hundred ninety-one million, twenty thousand, eight hundred ninety-three".