15493661 has 2 divisors, whose sum is σ = 15493662. Its totient is φ = 15493660.

The previous prime is 15493637. The next prime is 15493711. The reversal of 15493661 is 16639451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11764900 + 3728761 = 3430^2 + 1931^2 .

It is an emirp because it is prime and its reverse (16639451) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15493661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15493601) 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, 7746830 + 7746831.

It is an arithmetic number, because the mean of its divisors is an integer number (7746831).

Almost surely, 2^15493661 is an apocalyptic number.

It is an amenable number.

15493661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15493661 is an equidigital number, since it uses as much as digits as its factorization.

15493661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 15493661 is about 3936.1988008738. The cubic root of 15493661 is about 249.2975534573.

The spelling of 15493661 in words is "fifteen million, four hundred ninety-three thousand, six hundred sixty-one".