1921961163 has 16 divisors (see below), whose sum is σ = 2722048416. Its totient is φ = 1202073600.

The previous prime is 1921961149. The next prime is 1921961179. The reversal of 1921961163 is 3611691291.

It is not a de Polignac number, because 1921961163 - 2⁴ = 1921961147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1921961123) 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, 44238 + ... + 76163.

It is an arithmetic number, because the mean of its divisors is an integer number (170128026).

Almost surely, 2^1921961163 is an apocalyptic number.

1921961163 is a deficient number, since it is larger than the sum of its proper divisors (800087253).

1921961163 is a wasteful number, since it uses less digits than its factorization.

1921961163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120734.

The product of its digits is 17496, while the sum is 39.

The square root of 1921961163 is about 43840.1774973597. The cubic root of 1921961163 is about 1243.3160382002.

The spelling of 1921961163 in words is "one billion, nine hundred twenty-one million, nine hundred sixty-one thousand, one hundred sixty-three".