1161820503 has 20 divisors (see below), whose sum is σ = 1745971920. Its totient is φ = 769900032.

The previous prime is 1161820501. The next prime is 1161820549. The reversal of 1161820503 is 3050281611.

It is not a de Polignac number, because 1161820503 - 2¹ = 1161820501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161820501) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29418 + ... + 56471.

It is an arithmetic number, because the mean of its divisors is an integer number (87298596).

Almost surely, 2^1161820503 is an apocalyptic number.

1161820503 is a deficient number, since it is larger than the sum of its proper divisors (584151417).

1161820503 is an equidigital number, since it uses as much as digits as its factorization.

1161820503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86068 (or 86059 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1161820503 is about 34085.4881584524. The cubic root of 1161820503 is about 1051.2669522863.

The spelling of 1161820503 in words is "one billion, one hundred sixty-one million, eight hundred twenty thousand, five hundred three".