1151231011 has 8 divisors (see below), whose sum is σ = 1316388704. Its totient is φ = 986247360.

The previous prime is 1151230933. The next prime is 1151231023. The reversal of 1151231011 is 1101321511.

It is a happy number.

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

It is not a de Polignac number, because 1151231011 - 2²⁵ = 1117676579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151231111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29010 + ... + 56071.

It is an arithmetic number, because the mean of its divisors is an integer number (164548588).

Almost surely, 2^1151231011 is an apocalyptic number.

1151231011 is a deficient number, since it is larger than the sum of its proper divisors (165157693).

1151231011 is an equidigital number, since it uses as much as digits as its factorization.

1151231011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87021.

The product of its (nonzero) digits is 30, while the sum is 16.

The square root of 1151231011 is about 33929.7953280004. The cubic root of 1151231011 is about 1048.0632509826.

Adding to 1151231011 its reverse (1101321511), we get a palindrome (2252552522).

The spelling of 1151231011 in words is "one billion, one hundred fifty-one million, two hundred thirty-one thousand, eleven".