1641886961 has 16 divisors (see below), whose sum is σ = 1936146240. Its totient is φ = 1372653120.

The previous prime is 1641886937. The next prime is 1641886963. The reversal of 1641886961 is 1696881461.

It is a cyclic number.

It is not a de Polignac number, because 1641886961 - 2¹⁰ = 1641885937 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 (1641886963) 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 15 ways as a sum of consecutive naturals, for example, 17126 + ... + 59808.

It is an arithmetic number, because the mean of its divisors is an integer number (121009140).

Almost surely, 2^1641886961 is an apocalyptic number.

1641886961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1641886961 is a deficient number, since it is larger than the sum of its proper divisors (294259279).

1641886961 is a wasteful number, since it uses less digits than its factorization.

1641886961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42976.

The product of its digits is 497664, while the sum is 50.

The square root of 1641886961 is about 40520.2043553583. The cubic root of 1641886961 is about 1179.7258199038.

The spelling of 1641886961 in words is "one billion, six hundred forty-one million, eight hundred eighty-six thousand, nine hundred sixty-one".