1649917 has 2 divisors, whose sum is σ = 1649918. Its totient is φ = 1649916.

The previous prime is 1649887. The next prime is 1649927. The reversal of 1649917 is 7199461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1413721 + 236196 = 1189^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 1649917 - 2¹⁵ = 1617149 is a prime.

It is a super-2 number, since 2×1649917² = 5444452213778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649927) 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, 824958 + 824959.

It is an arithmetic number, because the mean of its divisors is an integer number (824959).

2^1649917 is an apocalyptic number.

It is an amenable number.

1649917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649917 is an equidigital number, since it uses as much as digits as its factorization.

1649917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 1649917 is about 1284.4909497540. The cubic root of 1649917 is about 118.1645936346.

The spelling of 1649917 in words is "one million, six hundred forty-nine thousand, nine hundred seventeen".