1231011331 has 8 divisors (see below), whose sum is σ = 1356218928. Its totient is φ = 1108020000.

The previous prime is 1231011269. The next prime is 1231011373. The reversal of 1231011331 is 1331101321.

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 1231011331 - 2⁹ = 1231010819 is a prime.

It is a super-3 number, since 3×1231011331³ (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 not an unprimeable number, because it can be changed into a prime (1231011391) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 552900 + ... + 555121.

It is an arithmetic number, because the mean of its divisors is an integer number (169527366).

Almost surely, 2^1231011331 is an apocalyptic number.

1231011331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231011331 is a deficient number, since it is larger than the sum of its proper divisors (125207597).

1231011331 is a wasteful number, since it uses less digits than its factorization.

1231011331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108133.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1231011331 is about 35085.7710617851. The cubic root of 1231011331 is about 1071.7348428413.

Adding to 1231011331 its reverse (1331101321), we get a palindrome (2562112652).

The spelling of 1231011331 in words is "one billion, two hundred thirty-one million, eleven thousand, three hundred thirty-one".