1801549 has 2 divisors, whose sum is σ = 1801550. Its totient is φ = 1801548.

The previous prime is 1801531. The next prime is 1801577. The reversal of 1801549 is 9451081.

It is a happy number.

It is an a-pointer prime, because the next prime (1801577) can be obtained adding 1801549 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 964324 + 837225 = 982^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801549 - 2⁵ = 1801517 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 (1801529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900774 + 900775.

It is an arithmetic number, because the mean of its divisors is an integer number (900775).

2^1801549 is an apocalyptic number.

It is an amenable number.

1801549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801549 is an equidigital number, since it uses as much as digits as its factorization.

1801549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1801549 is about 1342.2179405745. The cubic root of 1801549 is about 121.6789237250.

The spelling of 1801549 in words is "one million, eight hundred one thousand, five hundred forty-nine".