15641669 has 2 divisors, whose sum is σ = 15641670. Its totient is φ = 15641668.

The previous prime is 15641663. The next prime is 15641671. The reversal of 15641669 is 96614651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15108769 + 532900 = 3887^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 15641669 - 2⁴ = 15641653 is a prime.

It is a super-2 number, since 2×15641669² = 489323618211122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 15641671, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15641663) 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, 7820834 + 7820835.

It is an arithmetic number, because the mean of its divisors is an integer number (7820835).

Almost surely, 2^15641669 is an apocalyptic number.

It is an amenable number.

15641669 is a deficient number, since it is larger than the sum of its proper divisors (1).

15641669 is an equidigital number, since it uses as much as digits as its factorization.

15641669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 15641669 is about 3954.9549934228. The cubic root of 15641669 is about 250.0888697383.

The spelling of 15641669 in words is "fifteen million, six hundred forty-one thousand, six hundred sixty-nine".