11931613 has 2 divisors, whose sum is σ = 11931614. Its totient is φ = 11931612.

The previous prime is 11931553. The next prime is 11931691. The reversal of 11931613 is 31613911.

11931613 = 2442² + 2443².

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5968249 + 5963364 = 2443^2 + 2442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11931613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11931113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5965806 + 5965807.

It is an arithmetic number, because the mean of its divisors is an integer number (5965807).

Almost surely, 2^11931613 is an apocalyptic number.

11931613 is the 2443-rd centered square number.

It is an amenable number.

11931613 is a deficient number, since it is larger than the sum of its proper divisors (1).

11931613 is an equidigital number, since it uses as much as digits as its factorization.

11931613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 25.

The square root of 11931613 is about 3454.2166984716. The cubic root of 11931613 is about 228.5071109771.

It can be divided in two parts, 11931 and 613, that added together give a square (12544 = 112²).

The spelling of 11931613 in words is "eleven million, nine hundred thirty-one thousand, six hundred thirteen".