1161117229 has 4 divisors (see below), whose sum is σ = 1174163580. Its totient is φ = 1148070880.

The previous prime is 1161117203. The next prime is 1161117259. The reversal of 1161117229 is 9227111611.

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 800041225 + 361076004 = 28285^2 + 19002^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161117229 - 2²¹ = 1159020077 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 1161117229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161117259) 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, 6523042 + ... + 6523219.

It is an arithmetic number, because the mean of its divisors is an integer number (293540895).

Almost surely, 2^1161117229 is an apocalyptic number.

It is an amenable number.

1161117229 is a deficient number, since it is larger than the sum of its proper divisors (13046351).

1161117229 is an equidigital number, since it uses as much as digits as its factorization.

1161117229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13046350.

The product of its digits is 1512, while the sum is 31.

The square root of 1161117229 is about 34075.1702710346. The cubic root of 1161117229 is about 1051.0547915896.

The spelling of 1161117229 in words is "one billion, one hundred sixty-one million, one hundred seventeen thousand, two hundred twenty-nine".