1161817156 has 12 divisors (see below), whose sum is σ = 2033586940. Its totient is φ = 580792320.

The previous prime is 1161817127. The next prime is 1161817159. The reversal of 1161817156 is 6517181611.

It can be written as a sum of positive squares in 2 ways, for example, as 775065600 + 386751556 = 27840^2 + 19666^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1161817159) 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, 4221 + ... + 48388.

Almost surely, 2^1161817156 is an apocalyptic number.

It is an amenable number.

1161817156 is a deficient number, since it is larger than the sum of its proper divisors (871769784).

1161817156 is a wasteful number, since it uses less digits than its factorization.

1161817156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58134 (or 58132 counting only the distinct ones).

The product of its digits is 10080, while the sum is 37.

The square root of 1161817156 is about 34085.4390612766. The cubic root of 1161817156 is about 1051.2659427804.

Adding to 1161817156 its reverse (6517181611), we get a palindrome (7678998767).

The spelling of 1161817156 in words is "one billion, one hundred sixty-one million, eight hundred seventeen thousand, one hundred fifty-six".