1231131115 has 8 divisors (see below), whose sum is σ = 1495157328. Its totient is φ = 973038240.

The previous prime is 1231131107. The next prime is 1231131119. The reversal of 1231131115 is 5111311321.

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

It is not a de Polignac number, because 1231131115 - 2³ = 1231131107 is a prime.

It is a super-2 number, since 2×1231131115² = 3031367644642286450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231131092 and 1231131101.

It is not an unprimeable number, because it can be changed into a prime (1231131119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1482876 + ... + 1483705.

It is an arithmetic number, because the mean of its divisors is an integer number (186894666).

Almost surely, 2^1231131115 is an apocalyptic number.

1231131115 is a deficient number, since it is larger than the sum of its proper divisors (264026213).

1231131115 is an equidigital number, since it uses as much as digits as its factorization.

1231131115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2966669.

The product of its digits is 90, while the sum is 19.

The square root of 1231131115 is about 35087.4780370434. The cubic root of 1231131115 is about 1071.7696035618.

Adding to 1231131115 its reverse (5111311321), we get a palindrome (6342442436).

The spelling of 1231131115 in words is "one billion, two hundred thirty-one million, one hundred thirty-one thousand, one hundred fifteen".