1721093545 has 8 divisors (see below), whose sum is σ = 2070623880. Its totient is φ = 1373333760.

The previous prime is 1721093513. The next prime is 1721093597. The reversal of 1721093545 is 5453901271.

It can be written as a sum of positive squares in 4 ways, for example, as 2742336 + 1718351209 = 1656^2 + 41453^2 .

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

It is not a de Polignac number, because 1721093545 - 2⁵ = 1721093513 is a prime.

It is an unprimeable number.

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, 440496 + ... + 444385.

It is an arithmetic number, because the mean of its divisors is an integer number (258827985).

Almost surely, 2^1721093545 is an apocalyptic number.

It is an amenable number.

1721093545 is a deficient number, since it is larger than the sum of its proper divisors (349530335).

1721093545 is an equidigital number, since it uses as much as digits as its factorization.

1721093545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885275.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 1721093545 is about 41486.0644674811. The cubic root of 1721093545 is about 1198.3991489110.

The spelling of 1721093545 in words is "one billion, seven hundred twenty-one million, ninety-three thousand, five hundred forty-five".