10691609 has 2 divisors, whose sum is σ = 10691610. Its totient is φ = 10691608.

The previous prime is 10691599. The next prime is 10691627. The reversal of 10691609 is 90619601.

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., 10627600 + 64009 = 3260^2 + 253^2 .

It is an emirp because it is prime and its reverse (90619601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10691609 - 2⁸ = 10691353 is a prime.

It is a super-2 number, since 2×10691609² = 228621006017762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10691809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5345804 + 5345805.

It is an arithmetic number, because the mean of its divisors is an integer number (5345805).

Almost surely, 2^10691609 is an apocalyptic number.

It is an amenable number.

10691609 is a deficient number, since it is larger than the sum of its proper divisors (1).

10691609 is an equidigital number, since it uses as much as digits as its factorization.

10691609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 10691609 is about 3269.8025934298. The cubic root of 10691609 is about 220.2999283841.

The spelling of 10691609 in words is "ten million, six hundred ninety-one thousand, six hundred nine".