1189021993 has 4 divisors (see below), whose sum is σ = 1189254528. Its totient is φ = 1188789460.

The previous prime is 1189021991. The next prime is 1189021997. The reversal of 1189021993 is 3991209811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1189021993 - 2¹ = 1189021991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1189021991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108421 + ... + 118882.

It is an arithmetic number, because the mean of its divisors is an integer number (297313632).

Almost surely, 2^1189021993 is an apocalyptic number.

It is an amenable number.

1189021993 is a deficient number, since it is larger than the sum of its proper divisors (232535).

1189021993 is an equidigital number, since it uses as much as digits as its factorization.

1189021993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232534.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 1189021993 is about 34482.1982042909. The cubic root of 1189021993 is about 1059.4081165215.

The spelling of 1189021993 in words is "one billion, one hundred eighty-nine million, twenty-one thousand, nine hundred ninety-three".