1671258409 has 4 divisors (see below), whose sum is σ = 1672224516. Its totient is φ = 1670292304.

The previous prime is 1671258403. The next prime is 1671258427. The reversal of 1671258409 is 9048521761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9048521761 = 1307 ⋅6923123.

It can be written as a sum of positive squares in 2 ways, for example, as 1383616809 + 287641600 = 37197^2 + 16960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671258409 - 2⁵ = 1671258377 is a prime.

It is a super-2 number, since 2×1671258409² = 5586209339306422562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1671258403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480454 + ... + 483919.

It is an arithmetic number, because the mean of its divisors is an integer number (418056129).

Almost surely, 2^1671258409 is an apocalyptic number.

It is an amenable number.

1671258409 is a deficient number, since it is larger than the sum of its proper divisors (966107).

1671258409 is an equidigital number, since it uses as much as digits as its factorization.

1671258409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966106.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 1671258409 is about 40881.0274944258. The cubic root of 1671258409 is about 1186.7189256100.

The spelling of 1671258409 in words is "one billion, six hundred seventy-one million, two hundred fifty-eight thousand, four hundred nine".