1161277223 has 4 divisors (see below), whose sum is σ = 1183188168. Its totient is φ = 1139366280.

The previous prime is 1161277217. The next prime is 1161277241. The reversal of 1161277223 is 3227721611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3227721611 = 23029 ⋅140159.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161277223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1161277223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161277213) 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, 10955393 + ... + 10955498.

It is an arithmetic number, because the mean of its divisors is an integer number (295797042).

Almost surely, 2^1161277223 is an apocalyptic number.

1161277223 is a deficient number, since it is larger than the sum of its proper divisors (21910945).

1161277223 is an equidigital number, since it uses as much as digits as its factorization.

1161277223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21910944.

The product of its digits is 7056, while the sum is 32.

The square root of 1161277223 is about 34077.5178526840. The cubic root of 1161277223 is about 1051.1030654225.

Adding to 1161277223 its reverse (3227721611), we get a palindrome (4388998834).

The spelling of 1161277223 in words is "one billion, one hundred sixty-one million, two hundred seventy-seven thousand, two hundred twenty-three".