1161156031 has 8 divisors (see below), whose sum is σ = 1345214624. Its totient is φ = 981642240.

The previous prime is 1161156013. The next prime is 1161156043. The reversal of 1161156031 is 1306511611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1161156031 - 2⁷ = 1161155903 is a prime.

It is a super-3 number, since 3×1161156031³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1161155987 and 1161156005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161156001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1135650 + ... + 1136671.

It is an arithmetic number, because the mean of its divisors is an integer number (168151828).

Almost surely, 2^1161156031 is an apocalyptic number.

1161156031 is a deficient number, since it is larger than the sum of its proper divisors (184058593).

1161156031 is an equidigital number, since it uses as much as digits as its factorization.

1161156031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272401.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 1161156031 is about 34075.7396251351. The cubic root of 1161156031 is about 1051.0664994439.

Adding to 1161156031 its reverse (1306511611), we get a palindrome (2467667642).

The spelling of 1161156031 in words is "one billion, one hundred sixty-one million, one hundred fifty-six thousand, thirty-one".