1642171073 has 4 divisors (see below), whose sum is σ = 1682224068. Its totient is φ = 1602118080.

The previous prime is 1642171039. The next prime is 1642171109. The reversal of 1642171073 is 3701712461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3701712461 = 37307 ⋅99223.

It can be written as a sum of positive squares in 2 ways, for example, as 162384049 + 1479787024 = 12743^2 + 38468^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642171073 - 2⁶ = 1642171009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642171673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20026436 + ... + 20026517.

It is an arithmetic number, because the mean of its divisors is an integer number (420556017).

Almost surely, 2^1642171073 is an apocalyptic number.

It is an amenable number.

1642171073 is a deficient number, since it is larger than the sum of its proper divisors (40052995).

1642171073 is an equidigital number, since it uses as much as digits as its factorization.

1642171073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40052994.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 1642171073 is about 40523.7100103137. The cubic root of 1642171073 is about 1179.7938625359.

The spelling of 1642171073 in words is "one billion, six hundred forty-two million, one hundred seventy-one thousand, seventy-three".