1549997 has 2 divisors, whose sum is σ = 1549998. Its totient is φ = 1549996.

The previous prime is 1549987. The next prime is 1550027. The reversal of 1549997 is 7999451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1394761 + 155236 = 1181^2 + 394^2 .

It is an emirp because it is prime and its reverse (7999451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1549997 - 2⁴ = 1549981 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 (1549937) 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, 774998 + 774999.

It is an arithmetic number, because the mean of its divisors is an integer number (774999).

2^1549997 is an apocalyptic number.

It is an amenable number.

1549997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1549997 is an equidigital number, since it uses as much as digits as its factorization.

1549997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102060, while the sum is 44.

The square root of 1549997 is about 1244.9887549693. The cubic root of 1549997 is about 115.7293780621.

The spelling of 1549997 in words is "one million, five hundred forty-nine thousand, nine hundred ninety-seven".