1231613 has 2 divisors, whose sum is σ = 1231614. Its totient is φ = 1231612.

The previous prime is 1231597. The next prime is 1231631. The reversal of 1231613 is 3161321.

Together with next prime (1231631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 964324 + 267289 = 982^2 + 517^2 .

It is an emirp because it is prime and its reverse (3161321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231613 - 2⁴ = 1231597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231591 and 1231600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231663) 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 as a sum of consecutive naturals, namely, 615806 + 615807.

It is an arithmetic number, because the mean of its divisors is an integer number (615807).

2^1231613 is an apocalyptic number.

It is an amenable number.

1231613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231613 is an equidigital number, since it uses as much as digits as its factorization.

1231613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 17.

The square root of 1231613 is about 1109.7806089494. The cubic root of 1231613 is about 107.1909421414.

Adding to 1231613 its reverse (3161321), we get a palindrome (4392934).

The spelling of 1231613 in words is "one million, two hundred thirty-one thousand, six hundred thirteen".