1921089081 has 8 divisors (see below), whose sum is σ = 2561766624. Its totient is φ = 1280568800.

The previous prime is 1921089061. The next prime is 1921089083. The reversal of 1921089081 is 1809801291.

1921089081 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1921089081 - 2¹¹ = 1921087033 is a prime.

It is a super-2 number, since 2×1921089081² = 7381166514274849122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1921089083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7020 + ... + 62381.

It is an arithmetic number, because the mean of its divisors is an integer number (320220828).

Almost surely, 2^1921089081 is an apocalyptic number.

It is an amenable number.

1921089081 is a deficient number, since it is larger than the sum of its proper divisors (640677543).

1921089081 is an equidigital number, since it uses as much as digits as its factorization.

1921089081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78631.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 1921089081 is about 43830.2302184234. The cubic root of 1921089081 is about 1243.1279598986.

The spelling of 1921089081 in words is "one billion, nine hundred twenty-one million, eighty-nine thousand, eighty-one".