11997613 has 2 divisors, whose sum is σ = 11997614. Its totient is φ = 11997612.

The previous prime is 11997611. The next prime is 11997617. The reversal of 11997613 is 31679911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10738729 + 1258884 = 3277^2 + 1122^2 .

It is a cyclic number.

It is not a de Polignac number, because 11997613 - 2¹ = 11997611 is a prime.

Together with 11997611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11997611) 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, 5998806 + 5998807.

It is an arithmetic number, because the mean of its divisors is an integer number (5998807).

Almost surely, 2^11997613 is an apocalyptic number.

It is an amenable number.

11997613 is a deficient number, since it is larger than the sum of its proper divisors (1).

11997613 is an equidigital number, since it uses as much as digits as its factorization.

11997613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 37.

The square root of 11997613 is about 3463.7570642295. The cubic root of 11997613 is about 228.9276673213.

The spelling of 11997613 in words is "eleven million, nine hundred ninety-seven thousand, six hundred thirteen".