1171220005 has 4 divisors (see below), whose sum is σ = 1405464012. Its totient is φ = 936976000.

The previous prime is 1171220003. The next prime is 1171220009. The reversal of 1171220005 is 5000221711.

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

It can be written as a sum of positive squares in 2 ways, for example, as 454158721 + 717061284 = 21311^2 + 26778^2 .

It is not a de Polignac number, because 1171220005 - 2¹ = 1171220003 is a prime.

It is a super-2 number, since 2×1171220005² = 2743512600224400050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171220003) 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, 117121996 + ... + 117122005.

It is an arithmetic number, because the mean of its divisors is an integer number (351366003).

Almost surely, 2^1171220005 is an apocalyptic number.

It is an amenable number.

1171220005 is a deficient number, since it is larger than the sum of its proper divisors (234244007).

1171220005 is an equidigital number, since it uses as much as digits as its factorization.

1171220005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234244006.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 1171220005 is about 34223.0916925984. The cubic root of 1171220005 is about 1054.0943704232.

Adding to 1171220005 its reverse (5000221711), we get a palindrome (6171441716).

The spelling of 1171220005 in words is "one billion, one hundred seventy-one million, two hundred twenty thousand, five".