15820949 has 2 divisors, whose sum is σ = 15820950. Its totient is φ = 15820948.

The previous prime is 15820919. The next prime is 15820951. The reversal of 15820949 is 94902851.

15820949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14364100 + 1456849 = 3790^2 + 1207^2 .

It is an emirp because it is prime and its reverse (94902851) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15820949 is a prime.

Together with 15820951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15820919) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7910474 + 7910475.

It is an arithmetic number, because the mean of its divisors is an integer number (7910475).

Almost surely, 2^15820949 is an apocalyptic number.

It is an amenable number.

15820949 is a deficient number, since it is larger than the sum of its proper divisors (1).

15820949 is an equidigital number, since it uses as much as digits as its factorization.

15820949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 15820949 is about 3977.5556564302. Note that the first 3 decimals coincide. The cubic root of 15820949 is about 251.0407229049.

The spelling of 15820949 in words is "fifteen million, eight hundred twenty thousand, nine hundred forty-nine".