1161780203 has 4 divisors (see below), whose sum is σ = 1165227960. Its totient is φ = 1158332448.

The previous prime is 1161780199. The next prime is 1161780227. The reversal of 1161780203 is 3020871611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3020871611 = 313 ⋅9651347.

It is a cyclic number.

It is not a de Polignac number, because 1161780203 - 2² = 1161780199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161780253) 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, 1723373 + ... + 1724046.

It is an arithmetic number, because the mean of its divisors is an integer number (291306990).

Almost surely, 2^1161780203 is an apocalyptic number.

1161780203 is a deficient number, since it is larger than the sum of its proper divisors (3447757).

1161780203 is an equidigital number, since it uses as much as digits as its factorization.

1161780203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3447756.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1161780203 is about 34084.8969926564. The cubic root of 1161780203 is about 1051.2547970672.

The spelling of 1161780203 in words is "one billion, one hundred sixty-one million, seven hundred eighty thousand, two hundred three".