1646149 has 2 divisors, whose sum is σ = 1646150. Its totient is φ = 1646148.

The previous prime is 1646147. The next prime is 1646153. The reversal of 1646149 is 9416461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 889249 + 756900 = 943^2 + 870^2 .

It is an emirp because it is prime and its reverse (9416461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1646149 - 2¹ = 1646147 is a prime.

Together with 1646147, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1646149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1646143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823074 + 823075.

It is an arithmetic number, because the mean of its divisors is an integer number (823075).

2^1646149 is an apocalyptic number.

It is an amenable number.

1646149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646149 is an equidigital number, since it uses as much as digits as its factorization.

1646149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 1646149 is about 1283.0233824837. The cubic root of 1646149 is about 118.0745722251.

The spelling of 1646149 in words is "one million, six hundred forty-six thousand, one hundred forty-nine".