1191973103 has 4 divisors (see below), whose sum is σ = 1192899120. Its totient is φ = 1191047088.

The previous prime is 1191973099. The next prime is 1191973117. The reversal of 1191973103 is 3013791911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1191973103 - 2² = 1191973099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191973193) 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, 461075 + ... + 463652.

It is an arithmetic number, because the mean of its divisors is an integer number (298224780).

Almost surely, 2^1191973103 is an apocalyptic number.

1191973103 is a deficient number, since it is larger than the sum of its proper divisors (926017).

1191973103 is an equidigital number, since it uses as much as digits as its factorization.

1191973103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926016.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 1191973103 is about 34524.9634757229. The cubic root of 1191973103 is about 1060.2838633967.

The spelling of 1191973103 in words is "one billion, one hundred ninety-one million, nine hundred seventy-three thousand, one hundred three".