1641924449 has 4 divisors (see below), whose sum is σ = 1791190320. Its totient is φ = 1492658580.

The previous prime is 1641924439. The next prime is 1641924451. The reversal of 1641924449 is 9444291461.

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: 9444291461 = 11 ⋅858571951.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641924449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1641924439) by changing a digit.

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, 74632919 + ... + 74632940.

It is an arithmetic number, because the mean of its divisors is an integer number (447797580).

Almost surely, 2^1641924449 is an apocalyptic number.

It is an amenable number.

1641924449 is a deficient number, since it is larger than the sum of its proper divisors (149265871).

1641924449 is a wasteful number, since it uses less digits than its factorization.

1641924449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149265870.

The product of its digits is 248832, while the sum is 44.

The square root of 1641924449 is about 40520.6669367620. Note that the first 3 decimals coincide. The cubic root of 1641924449 is about 1179.7347984401.

The spelling of 1641924449 in words is "one billion, six hundred forty-one million, nine hundred twenty-four thousand, four hundred forty-nine".