1671382945 has 4 divisors (see below), whose sum is σ = 2005659540. Its totient is φ = 1337106352.

The previous prime is 1671382903. The next prime is 1671382967. The reversal of 1671382945 is 5492831761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1018120464 + 653262481 = 31908^2 + 25559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1671382945 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1671382895 and 1671382904.

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 3 ways as a sum of consecutive naturals, for example, 167138290 + ... + 167138299.

It is an arithmetic number, because the mean of its divisors is an integer number (501414885).

Almost surely, 2^1671382945 is an apocalyptic number.

It is an amenable number.

1671382945 is a deficient number, since it is larger than the sum of its proper divisors (334276595).

1671382945 is an equidigital number, since it uses as much as digits as its factorization.

1671382945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334276594.

The product of its digits is 362880, while the sum is 46.

The square root of 1671382945 is about 40882.5506175923. The cubic root of 1671382945 is about 1186.7484015140.

The spelling of 1671382945 in words is "one billion, six hundred seventy-one million, three hundred eighty-two thousand, nine hundred forty-five".