15223661 has 2 divisors, whose sum is σ = 15223662. Its totient is φ = 15223660.

The previous prime is 15223651. The next prime is 15223679. The reversal of 15223661 is 16632251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 2621161 = 3550^2 + 1619^2 .

It is an emirp because it is prime and its reverse (16632251) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15223661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15223661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15223601) 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, 7611830 + 7611831.

It is an arithmetic number, because the mean of its divisors is an integer number (7611831).

Almost surely, 2^15223661 is an apocalyptic number.

It is an amenable number.

15223661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15223661 is an equidigital number, since it uses as much as digits as its factorization.

15223661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 15223661 is about 3901.7510171716. The cubic root of 15223661 is about 247.8409327255.

The spelling of 15223661 in words is "fifteen million, two hundred twenty-three thousand, six hundred sixty-one".