1161121245 has 16 divisors (see below), whose sum is σ = 1858377600. Its totient is φ = 619070144.

The previous prime is 1161121243. The next prime is 1161121253. The reversal of 1161121245 is 5421211611.

It is a cyclic number.

It is not a de Polignac number, because 1161121245 - 2¹ = 1161121243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161121243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46231 + ... + 66779.

It is an arithmetic number, because the mean of its divisors is an integer number (116148600).

Almost surely, 2^1161121245 is an apocalyptic number.

1161121245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161121245 is a deficient number, since it is larger than the sum of its proper divisors (697256355).

1161121245 is a wasteful number, since it uses less digits than its factorization.

1161121245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24324.

The product of its digits is 480, while the sum is 24.

The square root of 1161121245 is about 34075.2291995226. The cubic root of 1161121245 is about 1051.0560033626.

Adding to 1161121245 its reverse (5421211611), we get a palindrome (6582332856).

The spelling of 1161121245 in words is "one billion, one hundred sixty-one million, one hundred twenty-one thousand, two hundred forty-five".