1801149521 has 8 divisors (see below), whose sum is σ = 1806946344. Its totient is φ = 1795363200.

The previous prime is 1801149503. The next prime is 1801149587. The reversal of 1801149521 is 1259411081.

It can be written as a sum of positive squares in 4 ways, for example, as 61842496 + 1739307025 = 7864^2 + 41705^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1801149521 - 2⁶ = 1801149457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1801149121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462635 + ... + 466511.

It is an arithmetic number, because the mean of its divisors is an integer number (225868293).

Almost surely, 2^1801149521 is an apocalyptic number.

It is an amenable number.

1801149521 is a deficient number, since it is larger than the sum of its proper divisors (5796823).

1801149521 is an equidigital number, since it uses as much as digits as its factorization.

1801149521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5251.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 1801149521 is about 42439.9519438936. The cubic root of 1801149521 is about 1216.6992928596.

The spelling of 1801149521 in words is "one billion, eight hundred one million, one hundred forty-nine thousand, five hundred twenty-one".