1921468081 has 16 divisors (see below), whose sum is σ = 2202681600. Its totient is φ = 1661413248.

The previous prime is 1921468069. The next prime is 1921468117. The reversal of 1921468081 is 1808641291.

It is a cyclic number.

It is not a de Polignac number, because 1921468081 - 2¹¹ = 1921466033 is a prime.

It is a super-2 number, since 2×1921468081² = 7384079172603645122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921468781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21721 + ... + 65686.

It is an arithmetic number, because the mean of its divisors is an integer number (137667600).

Almost surely, 2^1921468081 is an apocalyptic number.

It is an amenable number.

1921468081 is a deficient number, since it is larger than the sum of its proper divisors (281213519).

1921468081 is a wasteful number, since it uses less digits than its factorization.

1921468081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87528.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 1921468081 is about 43834.5535051972. The cubic root of 1921468081 is about 1243.2097042456.

The spelling of 1921468081 in words is "one billion, nine hundred twenty-one million, four hundred sixty-eight thousand, eighty-one".