1641871349 has 4 divisors (see below), whose sum is σ = 1642510560. Its totient is φ = 1641232140.

The previous prime is 1641871331. The next prime is 1641871393. The reversal of 1641871349 is 9431781461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9431781461 = 1019 ⋅9255919.

It is a cyclic number.

It is not a de Polignac number, because 1641871349 - 2⁸ = 1641871093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641871249) 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, 315737 + ... + 320894.

It is an arithmetic number, because the mean of its divisors is an integer number (410627640).

Almost surely, 2^1641871349 is an apocalyptic number.

It is an amenable number.

1641871349 is a deficient number, since it is larger than the sum of its proper divisors (639211).

1641871349 is an equidigital number, since it uses as much as digits as its factorization.

1641871349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639210.

The product of its digits is 145152, while the sum is 44.

The square root of 1641871349 is about 40520.0117102648. The cubic root of 1641871349 is about 1179.7220807227.

The spelling of 1641871349 in words is "one billion, six hundred forty-one million, eight hundred seventy-one thousand, three hundred forty-nine".