15349921 has 2 divisors, whose sum is σ = 15349922. Its totient is φ = 15349920.

The previous prime is 15349907. The next prime is 15349951. The reversal of 15349921 is 12994351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8059921 + 7290000 = 2839^2 + 2700^2 .

It is an emirp because it is prime and its reverse (12994351) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15349921 is a prime.

It is not a weakly prime, because it can be changed into another prime (15349951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7674960 + 7674961.

It is an arithmetic number, because the mean of its divisors is an integer number (7674961).

Almost surely, 2^15349921 is an apocalyptic number.

It is an amenable number.

15349921 is a deficient number, since it is larger than the sum of its proper divisors (1).

15349921 is an equidigital number, since it uses as much as digits as its factorization.

15349921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 15349921 is about 3917.8975229069. The cubic root of 15349921 is about 248.5242174051.

The spelling of 15349921 in words is "fifteen million, three hundred forty-nine thousand, nine hundred twenty-one".