1161215158 has 32 divisors (see below), whose sum is σ = 1913673600. Its totient is φ = 526009344.

The previous prime is 1161215149. The next prime is 1161215171. The reversal of 1161215158 is 8515121611.

It is a congruent number.

It is an unprimeable number.

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, 360258 + ... + 363466.

It is an arithmetic number, because the mean of its divisors is an integer number (59802300).

Almost surely, 2^1161215158 is an apocalyptic number.

1161215158 is a deficient number, since it is larger than the sum of its proper divisors (752458442).

1161215158 is a wasteful number, since it uses less digits than its factorization.

1161215158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624.

The product of its digits is 2400, while the sum is 31.

The square root of 1161215158 is about 34076.6071961397. The cubic root of 1161215158 is about 1051.0843395252.

Adding to 1161215158 its reverse (8515121611), we get a palindrome (9676336769).

The spelling of 1161215158 in words is "one billion, one hundred sixty-one million, two hundred fifteen thousand, one hundred fifty-eight".