1231040213 has 8 divisors (see below), whose sum is σ = 1327497528. Its totient is φ = 1134834624.

The previous prime is 1231040203. The next prime is 1231040231. The reversal of 1231040213 is 3120401321.

It can be written as a sum of positive squares in 4 ways, for example, as 377991364 + 853048849 = 19442^2 + 29207^2 .

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 1231040213 - 2⁴ = 1231040197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231040191 and 1231040200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231040203) 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, 52706 + ... + 72387.

It is an arithmetic number, because the mean of its divisors is an integer number (165937191).

Almost surely, 2^1231040213 is an apocalyptic number.

1231040213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1231040213 is a deficient number, since it is larger than the sum of its proper divisors (96457315).

1231040213 is a wasteful number, since it uses less digits than its factorization.

1231040213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125863.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1231040213 is about 35086.1826507245. The cubic root of 1231040213 is about 1071.7432244602.

Adding to 1231040213 its reverse (3120401321), we get a palindrome (4351441534).

The spelling of 1231040213 in words is "one billion, two hundred thirty-one million, forty thousand, two hundred thirteen".