1231131065 has 8 divisors (see below), whose sum is σ = 1511714688. Its totient is φ = 961999920.

The previous prime is 1231131059. The next prime is 1231131073. The reversal of 1231131065 is 5601311321.

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

It is not a de Polignac number, because 1231131065 - 2⁸ = 1231130809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231131065.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2862881 + ... + 2863310.

It is an arithmetic number, because the mean of its divisors is an integer number (188964336).

Almost surely, 2^1231131065 is an apocalyptic number.

It is an amenable number.

1231131065 is a deficient number, since it is larger than the sum of its proper divisors (280583623).

1231131065 is an equidigital number, since it uses as much as digits as its factorization.

1231131065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5726239.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1231131065 is about 35087.4773245385. The cubic root of 1231131065 is about 1071.7695890526.

Adding to 1231131065 its reverse (5601311321), we get a palindrome (6832442386).

The spelling of 1231131065 in words is "one billion, two hundred thirty-one million, one hundred thirty-one thousand, sixty-five".