1630549 has 2 divisors, whose sum is σ = 1630550. Its totient is φ = 1630548.

The previous prime is 1630547. The next prime is 1630597. The reversal of 1630549 is 9450361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1512900 + 117649 = 1230^2 + 343^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630549 - 2¹ = 1630547 is a prime.

Together with 1630547, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1630543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815274 + 815275.

It is an arithmetic number, because the mean of its divisors is an integer number (815275).

2^1630549 is an apocalyptic number.

It is an amenable number.

1630549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630549 is an equidigital number, since it uses as much as digits as its factorization.

1630549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1630549 is about 1276.9295203730. The cubic root of 1630549 is about 117.7004034407.

The spelling of 1630549 in words is "one million, six hundred thirty thousand, five hundred forty-nine".