1921490019 has 20 divisors (see below), whose sum is σ = 2962970560. Its totient is φ = 1239669360.

The previous prime is 1921490017. The next prime is 1921490023. The reversal of 1921490019 is 9100941291.

1921490019 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1921490019 - 2¹ = 1921490017 is a prime.

It is a super-2 number, since 2×1921490019² = 7384247786233240722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921490017) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 380104 + ... + 385125.

It is an arithmetic number, because the mean of its divisors is an integer number (148148528).

Almost surely, 2^1921490019 is an apocalyptic number.

1921490019 is a deficient number, since it is larger than the sum of its proper divisors (1041480541).

1921490019 is an equidigital number, since it uses as much as digits as its factorization.

1921490019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765272 (or 765263 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1921490019 is about 43834.8037408633. The cubic root of 1921490019 is about 1243.2144355985.

The spelling of 1921490019 in words is "one billion, nine hundred twenty-one million, four hundred ninety thousand, nineteen".