15661343 has 2 divisors, whose sum is σ = 15661344. Its totient is φ = 15661342.

The previous prime is 15661337. The next prime is 15661351. The reversal of 15661343 is 34316651.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15661343 - 2⁶ = 15661279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15661333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7830671 + 7830672.

It is an arithmetic number, because the mean of its divisors is an integer number (7830672).

Almost surely, 2^15661343 is an apocalyptic number.

15661343 is a deficient number, since it is larger than the sum of its proper divisors (1).

15661343 is an equidigital number, since it uses as much as digits as its factorization.

15661343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 15661343 is about 3957.4414714560. The cubic root of 15661343 is about 250.1936792480.

Adding to 15661343 its reverse (34316651), we get a palindrome (49977994).

The spelling of 15661343 in words is "fifteen million, six hundred sixty-one thousand, three hundred forty-three".