1649801 has 2 divisors, whose sum is σ = 1649802. Its totient is φ = 1649800.

The previous prime is 1649797. The next prime is 1649803. The reversal of 1649801 is 1089461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 952576 + 697225 = 976^2 + 835^2 .

It is an emirp because it is prime and its reverse (1089461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1649801 - 2² = 1649797 is a prime.

Together with 1649803, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1649803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824900 + 824901.

It is an arithmetic number, because the mean of its divisors is an integer number (824901).

2^1649801 is an apocalyptic number.

It is an amenable number.

1649801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649801 is an equidigital number, since it uses as much as digits as its factorization.

1649801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1649801 is about 1284.4457948859. The cubic root of 1649801 is about 118.1618243207.

The spelling of 1649801 in words is "one million, six hundred forty-nine thousand, eight hundred one".