1671859445 has 8 divisors (see below), whose sum is σ = 2006779320. Its totient is φ = 1337122240.

The previous prime is 1671859429. The next prime is 1671859487. The reversal of 1671859445 is 5449581761.

It can be written as a sum of positive squares in 4 ways, for example, as 977062564 + 694796881 = 31258^2 + 26359^2 .

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

It is not a de Polignac number, because 1671859445 - 2⁴ = 1671859429 is a prime.

It is a super-2 number, since 2×1671859445² = 5590228007671416050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1671859393 and 1671859402.

It is a congruent number.

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, 24650 + ... + 62859.

It is an arithmetic number, because the mean of its divisors is an integer number (250847415).

Almost surely, 2^1671859445 is an apocalyptic number.

It is an amenable number.

1671859445 is a deficient number, since it is larger than the sum of its proper divisors (334919875).

1671859445 is an equidigital number, since it uses as much as digits as its factorization.

1671859445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91335.

The product of its digits is 1209600, while the sum is 50.

The square root of 1671859445 is about 40888.3778719577. The cubic root of 1671859445 is about 1186.8611687855.

The spelling of 1671859445 in words is "one billion, six hundred seventy-one million, eight hundred fifty-nine thousand, four hundred forty-five".